Refrigerators are usually kept at about 5°C, while room temperature is about 20°C. If you were to take an ""empty"" sealed 2-liter soda bottle at room temperature and place it in the fridge, would you expect it to contract to one-fourth its original volume?
1. Yes, because 5 is one-fourth of 20.
2. No, because there is no gas inside the bottle.
3. No, because Celsius is not an absolute temperature scale.

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

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.

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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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.

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

Answer:

Metal Halide arc lamp

Explanation:

Metal Halide arc lamp:

Metal Halide arc lamps are made for film and television lighting production use in where daylight colour match and a high temporal stability are required, they are also used in solar simulation for testing sunscreens, plastics, solar cells as well as other devices and production materials

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

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:

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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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.

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.

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.

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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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

Real gases do not obey the ideal gas law

The pressure is less than predicted because of the attractive forces between the molecules as well as energy is lost during collision of a real gas

Reason:

The ideal gas equation is given as follows;

The real gas equation is presented as follows;

The coefficient +a, is the pressure correction factor, given that the pressure of  a real gas is lower than that of an ideal, due to the attractive force that exist between the gas molecules that reduces the number of collisions of the molecules with the container's wall when they attract each other

The collisions that occur in real gas involve energy loss, therefore, the molecules tend to be less activated as predicted by the real gas law

Therefore;

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Answer:

The limiting reactant is the ZnS

Explanation:

The equation for this reaction is:

2 ZnS + 3O₂ = 2 ZnO + 2 SO₂

2 moles of zinc sulfure reacts with 3 moles of oxygen.

Then, 1.72 mol of ZnS would react with ( 1.72 .3)/2 = 2.58 moles of O₂

If we have 3.04 moles, then the oxygen is the reactant in excess.

Let's confirm, the ZnS as the limiting reactant.

3 moles of oxygen react with 2 moles of sulfure.

Then, 3.04 moles of O₂ would react with (3.04 .2) / 3 = 2.02 moles of ZnS

We have 1.72 moles of Zn S and it is not enough for the 2.02 moles that we need, for the reaction.

Answer:

187.5 mL

Explanation:

From the question we are given;

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

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

[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:

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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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

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.

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

The coefficient of friction for the surface is approximately 0.235.

The coefficient of friction can be determined using the equation:

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:

Substituting the values into the equation:

Solving for the coefficient of friction:

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

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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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.

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.

Answer:

The answer is C. An electrochemical cell.

Explanation:

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

Answer:

m of NH3 = 6.46 g

Explanation:

First, in order to know the limiting and excess reactant, we need to write and balance the equation that is taking place:

NH₃ + O₂ ---------> NO + H₂O

Now, let's balance the equation:

4NH₃ + 5O₂ ---------> 4NO + 6H₂O

Now that we have the balanced equation, let's see which reactant is in excess. To know that, let's calculate the moles of each reactant using the molar mass:

MM NH3 = 17 g/mol

MM O2 = 32 g/mol

moles NH3 = 18.1 / 17 = 1.06 moles

moles O2 = 27.2 / 32 = 0.85 moles

Now, let's compare these moles with the theorical moles that the balanced equation gave:

4 moles NH3 --------> 5 moles O2

1.06 moles ----------> X

X = 1.06 * 5 / 4 = 1.325 moles of O2

These means in order to  NH3 completely reacts with O2, it needs 1.325 moles of O2, which we don't have it. We only have 0.85 moles of O2, therefore, the limiting reactant is the O2 and the excess is NH3.

Now, let's see how many grams in excess we have left after the reaction is complete.

4 moles NH3 --------> 5 moles O2

X moles NH3 ----------> 0.85 moles

X = 0.85 * 4 / 5 = 0.68 moles of NH3

This means that 0.85 moles of O2 will react with only 0.68 moles of NH3, and we have 1.06 so, the remaining moles are:

moles remaining of NH3 = 1.06 - 0.68 = 0.38 moles

Finally the mass:

m = 0.38 * 17

m = 6.46 g of NH3

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.

Answer:

Vapor pressure of solution → 186.3  Torr

Explanation:

To solve this problem we must apply the colligative property of vapor pressure.

ΔP =  P° . Xm

Where ΔP = Vapor pressure of pure solvent - Vapor pressure of solution

P° is vapor pressure of pure solvent → 187.5 Torr

Xm is the mole fraction of solute (moles of solute / total moles)

Let's determine the mole fraction,

Moles of solute = Mass of solute / Molar mass

24.5 g / 342 g/mol = 0.0716 moles

Moles of solvent = Moles of solvent /Molar mass

200 g / 18g/mol = 11.1 moles

Total moles = 11.1 moles + 0.0716 moles → 11.1716 moles

Mole fraction of solute = 0.0716 mol / 11.1716 mol = 6.40×10⁻³

Let's apply the formula

ΔP =  P° . Xm

Vapor P of pure solvent - Vapor P of solution = P° . 6.40×10⁻³

Vapor P of pure solvent  - 187.5 Torr . 6.40×10⁻³ = Vapor P of solution

187.5 Torr - 187.5 Torr . 6.40×10⁻³ = Vapor P of solution

Vapor pressure of solution → 186.3  Torr

The vapor pressure has been the pressure exerted by the molecules in the solution in vapor phase. The vapor pressure of water in solution is 186.3 torr

The colligative properties of the solution are dependent on the solute particles in the solution. The colligative properties include boiling point, freezing point, vapor pressure and osmotic pressure.

The change in the vapor pressure of the solution with the addition of solute ([tex]\Delta P[/tex]) is given as :

[tex]\Delta P=P^\circ\;\times\;x_m[/tex]

Where, the vapor pressure of the pure solvent, [tex]P^\circ=187.5\;\rm torr[/tex]

The mole fraction of the solute ([tex]x_m[/tex]) is given as:

[tex]x_m=\rm \dfrac{Moles\;solute}{Total\;moles}[/tex]

The moles of lactose in 24.5 grams of sample is:

[tex]\rm Moles\;solute=\dfrac{mass}{molar\;mass}\\\\ Moles\;lactose=\dfrac{24.5}{342\;g/mol} \\\\Moles\;Lactose=0.0706\;moles[/tex]

The moles of solvent water is given as:

[tex]\rm Moles\;solvent\;(water)=\dfrac{200}{18\;g/mol} \\Moles\;solvent=11.1\;mol[/tex]

The total moles of the solution is given as:

[tex]\rm Total \;moles=solute+solvent\\Total\;moles=0.0706+11.1\;mol\\Total \;moles=11.1706\;mol[/tex]

The moles fraction of solute is given as:

[tex]x_m=\dfrac{0.0706}{11.1706}\\\\ x_m=6.40\;\times\;10^{-3}[/tex]

The vapor pressure change in the solution is calculated as:

[tex]\Delta P=187.5\;\times\;6.40\;\times\;10^-^3\\\Delta P=1.2\;\rm torr[/tex]

The vapor pressure of the solution is given as:

[tex]\Delta P=\rm Solution\;vapor\;pressure-solvent\;vapor\;pressure\\1.2=Solution\;vapor\;pressure-187.5\;torr\\Solution\;vapor\;pressure=186.3\;torr[/tex]

The vapor pressure of the solution is 186.3 torr.

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Answer:

b. transfer of electron(s).

Explanation:

An oxidation-reduction also called a redox reaction is a

chemical reaction in which electrons are transferred of between two species of reactants. It is a chemical reaction where the oxidation number of an atom, ion, or molecule, increases or decreases by losing or gaining electrons

Biological oxidation-reduction reactions always involve transfer of electrons.

Oxidation involves loss of electrons in which the matter then becomes

positively charged . On the other hand, reduction involves the gain of

electrons and the matter becomes negatively charged.

Oxidation-reduction(Redox) reactions is an important aspect of reactivity of

elements. Atoms begin to react when movement of electrons occurs which

gives rise to their loss and gain.

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Answer:

The answer to your question is            C₂H₄  +  3O₂    ⇒    2CO₂   +  2H₂O

Explanation:

Data

Ethylene = C₂H₄

Oxygen = O₂

Carbon dioxide = CO₂

Water = H₂O

Reaction

                          C₂H₄  +  O₂    ⇒    CO₂   +  H₂O

                     Reactant       Element       Product

                           2              Carbon              1

                           4               Hydrogen         2

                           2               Oxygen             3

This reaction is unbalanced

                           C₂H₄  +  3O₂    ⇒    2CO₂   +  2H₂O

                     Reactant       Element       Product

                           2              Carbon              2

                           4               Hydrogen         4

                           2               Oxygen             6

Now, the reaction is balanced

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 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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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

Answer:

2. sand and gravel filtration.

Explanation:

Sand and/or gravel filters are made at home usually comprising of a pipe or tub filled with sand and gravel, while the advanced commercial systems usually filters contain other filtration media and processes such as charcoal filtration phytoremediation reverse osmosis

Wet oxidation

Activated sludge systems

Upflow anaerobic sludge

Vacuum evaporation

blanket digestion

Anaerobic filter

Urine-diverting dry toilet

Vermifilter

Activated sludge model

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.

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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I hope it helps you!