Acetylene gas C2H2 undergoes combustion to form carbon dioxide and water when it is used in the oxyacetylene torch for welding. Balance the reaction and answer the following questions.
C2H2(g)+O2(g) ---> CO2(g)+H2O(g)
a. How many grams of water can form if 113g of acetylene is burned?
b. How many grams of acetylene react if 1.10 mol of CO2 are produced?
PLEASE SHOW YOUR WORK!

Answers

Answer 1

Answer:

The answer to your question is below

Explanation:

Reaction

                            C₂H₂ (g) + O₂(g)   ⇒   CO₂ (g)   +  H₂O (g)

                            Reactants         Elements         Reactants

                                    2                       C                       1

                                    2                       H                       2

                                    2                       O                       3

This reaction is unbalance

Reaction balanced

                          2C₂H₂ (g) +   5O₂(g)   ⇒   4CO₂ (g)   +  2H₂O (g)

                            Reactants         Elements         Reactants

                                    4                       C                       4

                                    4                       H                       4

                                   10                       O                      10

Now, the reaction is balanced

a) Calculate the molecular mass of acetylene and water

Acetylene = (12 x 2) + (2) = 26 g

Water = (1 x 2) + (1 x 16) = 18 g

                           2(26) g of Acetylene ---------------  2(18) g of Water

                               113 g  of Acetylene --------------   x

                                x = (113 x (2 x 18)) / 2(26)

                                x = 4068 / 52

                               x = 78. 2 g of water

b)                2 moles of Acetylene ------------  4 moles of carbon dioxide

                   x moles of acetylene ------------  1.10 moles of carbon dioxide

                         x = (1.10 x 2) / 4

                        x = 0.55 moles of acetylene

Answer 2

Answer:

a) 78.19 grams H2O

b) 14.3 grams acetylene

Explanation:

Step 1: Data given

Molar mass of acetylene = 26.04 g/mol

Molar mass of H2O = 18.02 g/mol

Step 2: The balanced equation

2C2H2 + 5O2 → 4CO2 + 2H2O

Step 3: a. How many grams of water can form if 113g of acetylene is burned?

Calculate moles of acetylene:

Moles = mass / molar mass

Moles = 113.0 grams / 26.04 g/mol

Moles = 4.339 moles

calculate moles of H2O

For 2 moles acetylene we need 5 moles O2 to produce 4 moles CO2 and 2 moles H2O

For 4.339 moles of acetylene we'll have 4.339 moles H2O

Calculate mass of H2O

Mass H2O = 4.339 moles * 18.02 g/mol

Mass H2O = 78.19 grams H2O

b. How many grams of acetylene react if 1.10 mol of CO2 are produced?

For 2 moles acetylene we need 5 moles O2 to produce 4 moles CO2 and 2 moles H2O

For 1.10 mol CO2 we need 1.10/2 = 0.55 moles of acetylene

Mass acetylene = 0.55 moles * 26.04 g/mol

Mass acetylene = 14.3 grams acetylene


Related Questions

Which of the following pairs of substances best illustrates the law of multiple proportions?

Answers

Answer:

Answer:

Which of the following pairs of substances best illustrates the law of multiple proportions?

A. H2 and O2

B. NO and NO2

C. P2O5 and PH3

D. CaCl2 and CaBr2

B. NO and NO2

best shows the law of multiple proportions.

Explanation:

Which of the following pairs of substances best illustrates the law of multiple proportions?

A. H2 and O2

B. NO and NO2

C. P2O5 and PH3

D. CaCl2 and CaBr2

B. NO and NO2

best shows the law of multiple proportions.

law of simple multiple proportions. Law of multiple proportions, states that when two elements react with oneaother to form more than one compound, the weights of one element that combine with the fixed weight of the other element are in small whole number ratios.

Here Nitrogen, N which is fixed combines with Oxygen in two compounds in ratios 1 to 1 and 1 to 2

This triple beam balance is used to measure ________ in grams. A) density B) mass C) volume D) weight

Answers

Answer:

B) mass

Explanation:

Triple beam balance -

It is an instrument , which is used for the measurement of the mass , in a very accurate and precise manner .

The error range of this balance is +/- 0.05 gram .

It consists of three beam , of three different sizes , where the difference in the beam shows the difference in the weights and readings .

Hence, from the given statement of the question,

The correct option is B. mass.

This triple beam balance is used to measure mass in grams. Option B.

Functions of the triple beam balance

A triple beam balance is a common laboratory instrument used to measure the mass of an object. Mass is a fundamental property of matter and represents the amount of substance in an object.

The triple beam balance consists of three beams, each with different sliding weights. By adjusting these weights, the balance allows for the measurement of an object's mass in grams.

Mass is distinct from weight, which is the force exerted on an object due to gravity and can vary depending on the gravitational pull.

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A piece of silver with a mass 437 g has a heat capacity of 103.6 J/°C. What is the specific heat of silver?

Answers

Answer:

Specific heat of silver is 0.237 J/g°C

Explanation:

To define the heat capacity (c) we have to know that it depends on the amount of mass.

If our system consists of a single substance, we talk about specific heat (C) from the relationship:

c = C. m

103.6 J/°C = C . 437 g

103.6 J/°C / 437 g = C

C = 0.237 J/g°C

A solution surrounding a cell is hypertonic solution if: a. It contains fewer nonpenetrating solute particles than the interior of the cell b. It contains more nonpenetrating solute particles than the interior of the cell c. It contains the same amount of nonpenetrating solute particles as the interior of the cell

Answers

Answer:

The answer is B. It contains more non-penetrating solute particles than the interior of the cell.

Explanation:

This means that it has a greater concentration or number of solute particles outside a membrane than there are inside it.

A typical example is Saline solution.

Final answer:

In a hypertonic solution, the extracellular fluid has a higher concentration of solutes than the cell's cytoplasm. Water will leave the cell, causing it to shrink.

Explanation:

A hypertonic solution is any external solution that has a high solute concentration and low water concentration compared to body fluids. In a hypertonic solution, the net movement of water will be out of the body and into the solution.

This means that the solution contains more nonpenetrating solute particles than the interior of the cell. As a result, water will leave the cell, causing it to shrink.

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Hydrocarbons, compounds containing only carbon and hydrogen, are important in fuels. The heat of combustion of cyclopropane, C3H6, is 499.8 kcal/mol. Write a balanced equation for the complete combustion of cyclopropane. How much energy is released during the complete combustion of 497 grams of cyclopropane? kcal

Answers

Answer:

The complete combustion of cyclopropane is:

2C₃H₆  +  9O₂  →  6CO₂  +  6H₂O

5914.3kcal are realeased in the  combustion of 497 g of cyclopropane

Explanation:

Heat of combustion = 499.8 kcal/mol

This data means that 1 mol of C₃H₆ release 499.8 kcal.

Let's convert the mass to moles (mass / molar mass)

497 g / 42g/mol = 11.83 moles

Let's make a rule of three:

1 mol ____ 499.8

11.83 moles _____ (11.83  .499.8)/1 =5914.3kcal

The balanced equation for the complete combustion of cyclopropane:

C3H6 + 5O2 → 3CO2 + 3H2O

5748.7 kcal of energy is released during the complete combustion of 497 grams of cyclopropane.

The heat of combustion of cyclopropane is -499.8 kcal/mol, which means that 499.8 kcal of heat is released when 1 mole of cyclopropane is combusted.

To determine how much energy is released during the complete combustion of 497 grams of cyclopropane, we first need to determine the number of moles of cyclopropane in 497 grams.

The molar mass of cyclopropane is 42.08 grams/mol, so 497 grams of cyclopropane is equal to 497 / 42.08 = 11.5 moles of cyclopropane.

The energy released = (number of moles of cyclopropane) * (heat of combustion per mole of cyclopropane)

= 11.5 moles * 499.8 kcal/mol

= 5748.7 kcal

Therefore, 5748.7 kcal of energy is released during the complete combustion of 497 grams of cyclopropane.

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Solution A is 0.44 M and reacts with 0.11 M of solution B. Assume that the value of x is 0, the value of y is 1, and r is 1.07 × 10⁻¹ /s. Find the rate constant for this reaction.

Answers

Final answer:

The rate constant for the reaction is 0.973 L/mol/s.

Explanation:

In the given question, we are provided with the initial concentration of solution A and solution B, as well as the values of x, y, and r. To find the rate constant for this reaction, we can use the rate equation:

rate = k[A]^x[B]^y

Substituting the given values:

0.107/s = k(0.44 M)^0(0.11 M)^1

Simplifying the equation:

0.107/s = k(0.11 M)

Dividing both sides by 0.11 M:

k = 0.107/s / 0.11 M = 0.973 L/mol/s

____ are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bridges between molecules. a. Hydrogen bonds
b. Covalent bonds
c. Ionic bonds
d. Anionic bonds
e. Polar covalent bonds

Answers

Answer:Hydrogen bonds

Explanation:

Hydrogen bonds occur between molecules when hydrogen is covalently bonded to a highly electronegative element in each molecule of the compound E.g water. Hydrogen bonds are intermolecular bond forces. They hold molecules of a substance together in a particular state of matter. They do not link atoms together but they form bridges between molecules. Hydrogen bonds exist in liquid, solid and gaseous states of matter.

Final answer:

Hydrogen bonds are weak bonds that form bridges between molecules. They occur when a hydrogen atom is attracted to an atom with a partial negative charge.

Explanation:

Hydrogen bonds are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bridges between molecules. These bonds occur when a hydrogen atom with a partial positive charge is attracted to an atom with a partial negative charge.

An example of hydrogen bonding is the bond between water molecules. The partial positive charge of the hydrogen atom in one water molecule is attracted to the partial negative charge of the oxygen atom in a neighboring water molecule, resulting in hydrogen bonding.

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If a proton and an electron are released when they are 5.50×10−10 mm apart (typical atomic distances), find the initial acceleration of each of them.

Answers

Answer: The initial acceleration of the proton = (4.56 × 10^23) m/s2

The initial acceleration of the electron = (8.36 × 10^26) m/s2

Explanation: The force of attraction between the proton and electron can be computed using the statements of Coulomb's law which state that the force of attraction between two charged particles is directly proportional to the product of the two charges and inversely proportional to the square of their distances apart.

F = (Kq1q2)/(r^2) where K = (9 × (10^9) Nm(C^-2))

But q1 is the charge on a proton = (1.6 × (10^-19)) C

q2 is charge on an electron = -(1.6 × (10^-19)) C

r = (5.50 × (10^-10))mm = (5.50 × (10^-13))m

Computing all that, F = 0.0007616529 N = (7.62 × 10^-4) N

But the force of attraction is converted to that required for motion when they're released.

F = ma.

For proton, m = (1.67 × 10^-27) kg

a = F/m = 0.000762/(1.67 × 10^-27) = (4.56 × 10^23) m/s2

For electron, m = (9.11 × 10^-31) kg

a = F/m = 0.000762/(9.11 × 10^-31) = (8.36 × 10^26) m/s2

QED!

Final answer:

The initial acceleration of a proton and an electron, when released 5.50×10−10 mm apart, can be found using Coulomb's law and Newton's second law. The electrostatic force is first calculated using the charge of the particles and the separation distance, then divided by their respective masses to find their accelerations.

Explanation:

To calculate the initial acceleration of a proton and an electron when they are 5.50×10−10 mm apart, we use Coulomb's law which states that the electrostatic force (F) between two charges is proportional to the product of the charges and inversely proportional to the square of the distance between them. The formula is F = k × (q1 × q2) / r2, where k is the electrostatic constant (8.99×109 N×m2/C2), q1 and q2 are the charges of the proton and electron, and r is the separation distance. The acceleration (a) of each particle can then be found using Newton's second law (F = m × a), by dividing the electrostatic force by the mass (m) of the proton or electron respectively.

For a proton, the charge is +1.602×10−19 C and mass is 1.67×10−27 kg. For an electron, the charge is −1.602×10−19 C and mass is 9.11×10−31 kg. The initial acceleration for each particle can be calculated by using their respective masses and the electrostatic force derived from Coulomb's law.

Check all that apply.

a. Cathode rays have mass.
b. There are subatomic size particles in an atom.
c. In the atom, the particles of the cathode rays are embedded in a diffuse cloud of positive charge.
d. Matter contains negative charge and by inference positive charge.
e. Particles of the cathode rays are fundamental to all matter.

Answers

Answer:

a.Cathode rays have mass.

b.They are subatomic size particles in an atom.

d. Matter contains negative charge and by inference positive charge.

e. Particles of the cathode rays are fundamental to all matter.

Explanation:

The statements above reflect the Thompson model of the atom. Electrons were first known as cathode rays. The Thompson's model viewed the atom as a sphere of negative charges into which positive charges were embedded. This is the plum pudding model of the atom.

The removal of silver tarnish from silverware using aluminum foil and a solution of electrolyte is an example of
A) oxidation of aluminum metal.
B) reduction of silver ions.
C) an electrochemical cell.
D) all of the above

Answers

Answer:

The answer is C. An electrochemical cell.

Explanation:

The aluminum ion react with the sulfide to form aluminum sulfide.

If 0.255 moles of AgNO₃ react with 0.155 moles of H₂SO₄ according to this UNBALANCED equation below, how many grams of Ag₂SO₄ could be formed? AgNO₃(aq) + H₂SO₄ (aq) → Ag₂SO₄ (s) + HNO₃ (aq)

Answers

Final answer:

After balancing the chemical equation, we determine the limiting reactant, which is H₂SO₄ in this case. This produces 0.155 moles of Ag₂SO₄. When converted to mass, this is approximately 48.33g of Ag₂SO₄.

Explanation:

To answer this question, we first need to balance the chemical equation. The balanced equation is: 2 AgNO₃(aq) + H₂SO₄ (aq) → Ag₂SO₄ (s) + 2 HNO₃ (aq).

From the balanced equation, we can see that 2 moles of AgNO₃ react with 1 mole of H₂SO₄ to produce 1 mole of Ag₂SO₄. Thus, the mole ratio of AgNO₃ : H₂SO₄ : Ag₂SO₄ is 2:1:1.

Given that we have 0.255 moles of AgNO₃ and 0.155 moles of H₂SO₄, it’s clear that H₂SO₄ is the limiting reactant as it produces fewer moles of Ag₂SO₄ (based on the stoichiometric ratios). Therefore, 0.155 moles of Ag₂SO₄ will be formed.

To convert this to grams, we multiply by the molar mass of Ag₂SO₄, which is 311.8 g/mol: 0.155 moles * 311.8 g/mol = 48.33 grams of Ag₂SO₄ can be formed.

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To calculate the grams of Ag2SO4 formed, we first determine the limiting reactant from the balanced equation and then convert the moles of the limiting reactant to grams using its molar mass, resulting in 48.329 grams of Ag2SO4.

The question asks how many grams of Ag2SO4 could be formed when 0.255 moles of AgNO3 reacts with 0.155 moles of H2SO4. To solve this, we must balance the chemical equation and determine the limiting reactant.

First, we balance the equation:
2 AgNO3(aq) + H2SO4 (aq) → Ag2SO4 (s) + 2 HNO3 (aq)

With this balanced equation, we see that two moles of AgNO3 are needed to react with one mole of H2SO4. Since we have 0.255 moles of AgNO3 and 0.155 moles of H2SO4, H2SO4 is the limiting reactant. The mole ratio of H2SO4 to Ag2SO4 is 1:1, therefore 0.155 moles of Ag2SO4 will be formed.

To find the mass of Ag2SO4 formed, we use its molar mass (311.8 g/mol):
0.155 moles × 311.8 g/mol = 48.329 grams of Ag2SO4.

If an atom of thorium-234 were to undergo beta emission twice, which atom would result?


Rn-226


U-234


Th-230


U-238

Answers

Answer:

The answer to your question is  U-234

Explanation:

Data

Thorium-234

beta emission twice

Definition

Beta emission is when a beta particle (electron) is emitted from an atomic nucleus.

First beta emission

                                            ²³⁴₉₀Th   ⇒    ²³⁴₉₁Pa + e⁻

Second beta emission

                                            ²³⁴₉₁ Pa   ⇒  ²³⁴₉₂U  + e⁻

The atom will be Uranium-324

Answer: U-234

Explanation: no matter how much of beta decay, the mass number of the resulting element is unchanged

A block weighing 8.5 N requires a force of 2 Nto push it along at constant velocity.What is the coefficient of friction for thesurface?

Answers

Answer:

The coefficient of friction of the surface μ = 0.235

Explanation:

Values of the given variables:

Weight of block = 8.5 N

Pushing force F = 2 N

velocity = constant

Solution:

Newton's Second Law of motion states that acceleration of an object depends on the mass of the object and the force applied

F = m a

Since v =constant, a = 0. Thus

Net force Fnet = 0.

Now F_net is the sum of the pushing force and the frictional force along the horizontal, which opposes the motion:

Fnet = Fpushing - Ffrictional_force

Given that Fnet = 0, Fpushing = Ffrictional_force. and Ffrictional_force = 2 N

Equation of friction is given by

Ffrictional_force = μ*W

2 = μ*8.5

μ = 2/8.5 = 0.235

Final answer:

The coefficient of friction for the surface is approximately 0.235.

Explanation:

The coefficient of friction can be determined using the equation:

frictional force = coefficient of friction × normal force

Given that the weight of the block is 8.5 N, and the force required to push it at constant velocity is 2 N, we can determine the normal force as follows:

normal force = weight of the blocknormal force = 8.5 N

Substituting the values into the equation:

2 N = coefficient of friction × 8.5 N

Solving for the coefficient of friction:

coefficient of friction = 2 N / 8.5 Ncoefficient of friction ≈ 0.235

Therefore, The coefficient of friction for the surface is approximately 0.235.

A white substance melts with some decomposition at 730oC. As a solid it does not conduct electricity, but it dissolves in water to form a conducting solution. With explanation, which type of solid might the substance be?

Answers

Answer:

Ionic solid

Explanation:

Ionic solids -

These are the type of solids , which is composed of ions , which are bond by very strong electrostatic force of attraction , are referred to as ionic solids.

And due to very strong force of attraction between the ions , they generally have very high melting point.

When the solid is dissolved in water , the ions gets separate out , and these free ions are capable to conduct electricity , and hence they are very good conductor in molten form , and are insulator in solid form.

Hence , from the given information of the question ,

The correct term is ionic solids.

A sample of argon gas has a volume of 500 mL at a pressure of 1.5 atm. If the pressure is increased to 4.0 atm, the new volume is given by

Answers

Answer:

187.5 mL

Explanation:

From the question we are given;

Initial volume of the gas, V₁ = 500 mLInitial pressure of the gas, P₁ = 1.5 atmNew pressure of the gas, P₂ = 4.0 atm

We are required to determine the new volume of the gas;

We are going to use Boyle's law of gases.

According to Boyle's law, the volume of a fixed mass of a gas and pressure are inversely proportional at a constant absolute temperature.That is;

[tex]P\alpha\frac{1}{V}[/tex]

[tex]P=\frac{k}{V}[/tex]

At different pressures and volume with constant temperature, then

[tex]P_{1}V_{1}=P_{2}V_{2}[/tex]

Rearranging the formula;

[tex]V_{2}=\frac{P_{1}V_{1}}{P_{2}}[/tex]

Thus;

[tex]V_{2}=\frac{(500mL)(1.5 atm)}{4.0 atm}[/tex]

    [tex]=187.5 mL[/tex]

Thus, the new volume of the gas is 187.5 mL

Answer:

1.5x500

————-

4.0

Explanation:

Mendeleev organized the elements
a. alphabetically by name.
b. by the number of electrons.
c. by increasing the atomic number and similar properties.
d. by increasing atomic weight and similar properties.

Answers

Answer:

D

Explanation:

Mendeleev was a Russian scientist. His works provided the framework for the present day periodic table. What Mendeleev did was to arrange the elements in order of their atomic weights.

He however had some gaps in his periodic table. He impressively predicted the elements that would fill in these blank spaces even though they were yet to be discovered as at then.

(a) How many moles of CO2 contain 2.42 ✕ 1024 molecules?
WebAssign will check your answer for the correct number of significant figures. [blank] mol CO2

(b) What number of moles is equivalent to 6.23 ✕ 1021 atoms of Hg?
WebAssign will check your answer for the correct number of significant figures. [blank] mol Hg
Please fill in the blanks

Answers

Don’t currently have a calculator with me but just use Avogadros constant (A) 6.02x10^24, in the equation n=N/A. Lower case n being the number of mol and upper case being the number of molecules (given).

When calculating the number of moles of CO₂ and Hg, we have:

a) There are 4.02 moles of CO₂ in 2.42x10²⁴ molecules.

b) There are 0.010 moles of Hg in 6.23x10²¹ atoms.

a) The number of moles of CO₂ that are in 2.42x10²⁴ molecules can be calculated with Avogadro's number (N = 6.022x10²³)

[tex] n = \frac{1 mol}{6.022 \cdot 10^{23} \:molecules}*2.42 \cdot 10^{24} \:molecules = 4.02 moles [/tex]    

Hence, the number of moles of CO₂ is 4.02.

b) To find the number of moles of Hg equivalent to 6.23x10²¹ atoms, we need to use Avogadro's number:

[tex] n = \frac{1 mol}{6.022 \cdot 10^{23} \: atoms}*6.23 \cdot 10^{21} \: atoms = 0.010 moles [/tex]

Therefore, the number of moles of Hg is 0.010.  

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If you start with 10.0 grams of lithium hydroxide and an excess of hydrogen bromide, how many grams of lithium bromide will be produced?

Answers

Answer:

grams of lithium bromide produced = 36.2642309286  ≈ 36.30 g

Explanation:

The equation of the reaction is as follows ;

Lithium hydroxide + hydrogen bromide → Lithium Bromide + water

LiOH + HBr → LiBr + H2O

The equation is already balanced

Molecular mass of LiOH = 6.941  + 15.999 + 1.00784

Molecular mass of LiOH = 23.94784  g

Molecular mass of LiBr = 6.941 + 79.904 = 86.845  g

From the equation

LiOH + HBr → LiBr + H2O

23.94784  g of lithium hydroxide produces 86.845  g of lithium bromide

10 g of lithium hydroxide will produce ?

cross multiply

grams of lithium bromide produced = 10 × 86.845/23.94784

grams of lithium bromide produced = 868.45/23.94784

grams of lithium bromide produced = 36.2642309286  ≈ 36.30 g

Which response includes all the following that are properties of most metals, and no other properties?
Z1) They tend to form cations.
Z2) They have high first ionization energies.
Z3) They have outer electronic shells that are more than half-filled.
Z4) They tend to form ionic compounds when they combine with the elements Group VIIA.

1. Z3 and Z4 only
2. Z2, Z3, and Z4 only
3. Z1, Z2, and Z3 only
4. Z1 and Z4 only
5. Z1 and Z3 only

Answers

Answer:Z1 and Z4 only

Explanation:

One general property of all metals is that they form positive ions (cations) by electron loss. Secondly, elements of group VIIA have high electron affinities hence they easily accept electrons to form negative ions. The bonding between metals and elements in this group is almost always ionic in nature.

A student obtains a mixture of the chlorides of two unknown metals, X and Z. The percent by mass of X and the percent by mass of Z in the mixture is known. Which of the following additional information is most helpful in calculating the mole percent of XCl(s) and of ZCl(s) in the mixture?

Answers

Answer:

the Molar masses of Z and X

Explanation:

The percent by mass of X states how many grams of X are in 100 grams of the mixture. Then, we know how many grams of X, Z (we also know its percent) and of Cl ( = 100 - X % - Z %). Taking 100 g of the mixture as a base, we have:

x grams of X

z grams of Z

y grams of Cl

With the molar masses of Z and X (and of Cl) we can transform all masses into moles and then compute the mole percent of XCl(s) and of ZCl(s) in the mixture

From the given information:

The percent by mass of X = KnownThe percent by mass of Z = Known

The percentage mass is given as the mass of the element which is divided by mass of compound multiplied by 100.

it is estimated using the formular:

[tex]\mathbf{percentage \ mass = \dfrac{\text{mass of element in 1 mole of compound}} { \text{mass of 1 mole of compound}} \times 100}[/tex]

From there;

The mole percentage is determined, which is the ratio of moles in a substance (element or compound) divided by the total amount of the mixture.

Using the formula:

Mole percentage = mole fraction × 100

Since the mole fraction is not given, it can be estimated as well by using the formula:

[tex]\mathbf{Mole\ fraction = \dfrac{\text{No of moles of a component} }{\text{total number of moles of the compound}}}[/tex]

Eventually; To determine the unknown number of moles, we will need the value of their respective molar masses(i.e. for X and Z) by using the formula:

[tex]\mathbf{Number \ of \ moles = \dfrac{Mass}{Molar \ Mass}}[/tex]

In conclusion, the additional information required in calculating the mole percent of XCl(s) and ZCl(s) in the mixture is the molar mass of X and Z.

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If an aqueous solution of lead(II) nitrate (Pb(NO3)2) is mixed with an aqueous solution of potassium chloride (KCl) the precipitate is:

Answers

Answer: lead(II) chloride PbCl2

Explanation:

Pb(NO3)2 + 2KCl —> PbCl2 + 2KNO3

Taking into account the definition of net ionic equation, a precipitate of PbCl₂ is formed when an aqueous solution of lead(II) nitrate (Pb(NO₃)₂) is mixed with an aqueous solution of potassium chloride (KCl) .

The net ionic equation is a chemical equation for a reaction that lists only the species that participate in the reaction.

In other words, an ionic equation is a chemical equation where electrolytes in aqueous solution are written as dissociated ions.  

In this case, the balanced equation will be:

Pb(NO₃)₂ (aq) + 2 HCl (aq) → PbCl₂ (s) + 2 HNO₃ (aq)

where (aq) means aqueous and (s) solid.

Taking into account that:

All Cl⁻, Br⁻ and I⁻ salts are soluble. All salts of NO₃⁻, C₂H₃O₂⁻, ClO₃⁻ and ClO₄⁻ are soluble.All Ag⁺, Pb²⁺ and Hg₂²⁺ salts are insoluble.

The total ionic equation in separated aqueous solution will be:

Pb²⁺(aq) + 2 NO₃⁻(aq) + 2 H⁺ (aq) + 2 Cl⁻ (aq) → PbCl₂ (s) + 2 H⁺ (aq) + 2 NO₃⁻ (aq)

A spectator ion is an ion that appears both as a reactant and as a product in an ionic equation.

Spectator ions can be either cations (positively charged ions) or anions (negatively charged ions).

When writing a net ionic equation, spectator ions found in the original equation are ignored. Thus, the total ionic reaction is different from the net chemical reaction.

In this case, H⁺ and NO₃⁻ are the spectator ions because they appear unchanged in both the product and the reagent. So these ions cancel out by writing the net ionic equation and you get:

Pb²⁺(aq) + 2 Cl⁻ (aq) → PbCl₂ (s)

Since PbCl₂ is an insoluble salt, it will precipitate.

Finally, a precipitate of PbCl₂ is formed when an aqueous solution of lead(II) nitrate (Pb(NO₃)₂) is mixed with an aqueous solution of potassium chloride (KCl) .

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A student obtained 1.69 g of pure caffeine following recrystallization from a crude sample, which originally weighed 2.51 g. What is the percent recovery of pure caffeine from crude?

Answers

Answer:

The recovery of pure caffeine is 67.3% of the original, crude sample.

Explanation:

Step 1: Data given

Mass of pure caffeine = 1.69 grams

Original mass of sample = 2.51 grams

Step 2: What is the percent recovery of pure caffeine from crude?

Percentage = (mass of recovery / original mass) *100%

Percentage = (1.69 grams/2.51 grams) *100%

Percentage = 67.3 %

The recovery of pure caffeine is 67.3% of the original, crude sample.

A 44.0mg sample of carbon reacts with sulfur to form 122 mg of the compound.
What is the empirical formula of the carbon sulfide? Express answer as a chemical formula.

Answers

Answer:

Empirical formula = C₃S₂

Explanation:

Given data:

Mass of carbon = 44.0 mg (44/1000 = 0.044 g)

Mass of sulfur = 122 mg - 44.0 mg = 78 mg = 78/1000 = 0.078 g)

Empirical formula = ?

Solution:

First of all we will calculate the number of moles.

Number of moles of carbon = mass / molar mass

Number of moles of carbon = 0.044 g/ 12.01 g/mol

Number of moles of carbon = 0.0037 mol

Number of moles of sulfur:

Number of moles = mass / molar mass

Number of moles = 0.078 g/ 32,066 g/mol

Number of moles  = 0.0024 mol

Now we will compare the moles:

                C                            :                  S

             0.0037/0.0024        :             0.0024/0.0024

                  1.5                         :               1

C : S = 2(1.5 : 1)

C : S = 3 : 2

Empirical formula = C₃S₂

 

Broad-spectrum pesticides: kill beneficial organisms in addition to the targeted pest. are readily broken down into safe materials such as water and CO2. are ineffective.

Answers

Answer:

kill beneficial organisms in addition to the targeted pest

Explanation:

The use of pesticides have emerged as one of the main options used in the control of invertebrate pests in different parts of the world. Organophosphate is the mostly used form of pesticide in places like Australia. There have been reported issues of crops losses from the incidences of pests, despite the increase in the use of pesticides. Broad spectrum pesticides end up kill non-target invertebrate species together with the insects and mites they are out to eliminate

Manganese nodules are considered a valuable resource from the ocean floor because they are abundant and contain not only manganese but also?

Answers

Answer: iron (oxides of iron)

Explanation: manganese nodules usually contain layers of iron and manganese oxides in a concentric arrangement and are called polymetallic nodules.

Titanium (III) chloride, a substance used in catalysts for preparing polyethylene, is made by high-temperature reaction of TiCl4 vapor with H2 :

2TiCl4(g) + H2(g) --> 2TiCl3(s) + 2HCl(g)

a) how many grams of TiCl4 are needed for complete reaction with 155L if H2 at 430 degrees C and 780mmHg pressure?

b) How any liters of HCl gas at STP will result from the reaction described in part (a)?

Answers

Answer: a. 1046.98g b. 123.64 L

Explanation:

.a. To determine the mass of TiCl4 needed to complete the reaction with 155 liters of H2 at 430 degree Celsius and 780 mmHg pressure.

First, use the ideal gas equation to determine the number of moles of H2.

PV = nRT

R= 0.082 Latm/molK

Convert Pressure to atmosphere and temperature to kelvin so the units of calculation can be uniform;

1 atm is equals to 760 mmHg so 780mmHg will be (780/760) atm = 1.0263 atm

430 degree Celsius = (430 +273.15) K

= 703.15 K

Therefore, n = PV/RT

= (1.0263*155)/ (0.082*703.15)

= 2.76 of H2 will be needed to complete the reaction

From the chemistry of the reaction, it can be seen that 2 moles of TiCl4 is needed to react with 1 mole of H2.

So for 2.76 moles of H2 , (2*2.76 moles) of TiCl4 will be needed which is equals to 5.52 moles of TiCl4.

The mass of TiCl4 can be calculated using the formular;

Mass = molar mass * number of moles

The molar mass of TiCl4 cab be calculated using the molar mass of each of its element (Ti =47.87 g/mol, Cl= 35.45 g/mol).

The molar mass of TiCl4 = 47.87 + (4*35.35) = 189.67 g/mol

Therefore,

The mass of TiCl4 = 189.67 g/mol * 5.52 mols

= 1046.98 g of TiCl4.

b. The amount of liters of HCl gas to be produced at STP. STP means standard temperature and pressure which is 273.15 K and 1 atm

From the chemistry of the reaction, it can be seen that with 1 mole of H2 is needed to produce 2 moles of HCl.

So for 2.76 moles of H2, (2*2.76 moles) of HCl will be produced which is equals to 5.52 moles of HCl. Therefore, the volume of HCl produced at 430 degree Celsius and 780 mmHg pressure will be;

V = nRT/P

= 5.52* 0.082 *703.15 / 1.0263

= 310.118 L

The combined gas law states that PV/T = constant. Therefore

P1V1/T1 = P2V2/T2

Now using the combined gas law;

P1 = 1.0263 atm, V1 = 310.118 L, T1 = 703.15 K

P2 = 1 atm, V2 =?, T2 = 273.15 k

So,

V2 = (1.0263*310.118*273.15)/ (1*703.15)

= 123.64 L

Final answer:

To find the grams of TiCl4 needed, use the ideal gas law equation and the balanced chemical equation. To find the liters of HCl gas at STP, use the ideal gas law equation and the balanced chemical equation.

Explanation:

In order to determine the grams of TiCl4 needed, we need to use the ideal gas law equation: PV = nRT. First, we need to convert the given volume of H2 to moles by using the ideal gas law. Then, we can use the balanced chemical equation to find the ratio of moles of H2 to moles of TiCl4. Finally, we can convert moles of TiCl4 to grams using the molar mass of TiCl4.

To determine the liters of HCl gas at STP, we can use the ideal gas law equation again. We can find the moles of HCl gas produced by using the balanced chemical equation, and then convert the moles to liters at STP using the molar volume of a gas at STP.

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Dead space is the portion of the respiratory system that: Select one: A.. must be filled with air before gas exchange can take place. B. contains no alveoli and does not participate in gas exchange. C. includes the alveoli and capillaries surrounding the alveoli. D. receives oxygen but is unable to release carbon dioxide.

Answers

Answer: Option B

Explanation:

Dead space is the volume of sir in the body which is inhaled but it does not takes part in the gaseous exchange this is because it does not contains alveoli.

Not all the air that is inhaled inside the body is used in the process of respiration.

The dead space in the lungs is the region which helps in conducting airways, the air is not perfused to the alveoli.

Dead space is the portion of the respiratory system that contains no alveoli and does not participate in gas exchange. Therefore, option B is correct.

The respiratory system is a complex network of organs and tissues involved in the process of respiration.

Dead space refers to the portion of the respiratory system where there is no gas exchange occurring. It includes areas such as the trachea, bronchi, and bronchioles, which do not have alveoli. In these regions, the primary function is to conduct air to and from the alveoli, but no actual gas exchange occurs.

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The combustion of palmitic acid in a bomb calorimeter yields energy in the form of heat released upon oxidation. From a thermodynamic perspective and with respect to the calorimeter experiment, what would you expect the combustion of the same amount of palmitic acid in our body to yield?a. less energyb. more energyc. the same amount of energyd. The calorimeter experiment is irrelevant to the combustion of palmitic acid in the human body.

Answers

Answer:

"The same amount of energy" is the combustion of the same amount of palmitic acid in our body to yield.

Explanation:

A bomb calorimeter is an apparatus used to measure the amount of heat out or fascinated by a chemical reaction. This apparatus is airtight and has thermal insulation, which means that the organization doesn't alteration heat with the environments. So, by the variance of the temperature measured on the system (ΔT), the mass of a solution (m) and the specific heat of water (c) it's likely to compute the heat in a reaction that happens in aqueous solution, by the equation below:

                                           Q = [tex]m \times c\times \delta T[/tex]

The heat, or the energy, of the response doesn't depend on where the response is happening, so the sum of energy measured on the bomb calorimeter will be the same in our body.

How many hydrogen atoms are connected to the indicated carbon atom?

Answers

Answer:

Your question is incomplete, but it could deal with organic structures just like the ones I attached in this answer. So I hope it helps you.

Q1. A) One hydogen atom

Q2. E) None

Q3. A) One Hydrogen atom

Explanation:

Each carbon can make 4 covalent bonds with Hydrogene because of its 4 valencies. If a carbon has only three covalent bonds, the C atom will be charged; in the 3 questions that I´m aswering here, the carbons are charged and they are carbocations (there is no lone pair of electrons and the charge is positive). We can also find carbanions (there is one lone pair of electrons and the charge is negative).

In the molecules on the attachement file, you can notice that the first one has already 2 bonds with adjacent carbons, the next one has 3 bonds and the last one has 2; in every structure, the indicated carbon is a carbocation (no lone pairs of electons).  A cabocation can make 3 covalent bonds, so, for the first and the last molecules, there is one hyrogen atom connected to it, for the second there is none.

Lead has a density of 11.34 g/ml where as mercury has a density of 13.6 g/ml. If 1 kg of each were placed in buckets of water which one would displace more water?

Answers

the bucket with lead added would replace more water, as it would require more volume to achieve the same mass.
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