An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 123 amu and 125 amu, with natural abundances of 95% and 5%, respectively. Calculate its average atomic mass. Report your answer to 1 decimal place.

Answer:

10.6 moles of CO₂ are produced in this combustion

Explanation:

The combustion reaction is:

2C₂H₆ (g) + 7O₂ (g) ⟶ 4CO₂ (g) + 6H₂O (g)

We assume the ethane as the limiting reactant because the excersise states that the O₂ is in excess.

We make a rule of three:

2 moles of ethane can produce 4 moles of CO₂

Therefore 5.30 moles of ethane will produce (5.3 . 4) /2 = 10.6 moles

Answer:

A. atmospheric CO2 increases

Explanation:

The concentration of CO2 during the Paleozoic era was much higher than the current one, due to geographical factors, but not the chemical composition of the air, which should have been more important in increasing this gas.

The highest concentrations of CO2 during the Paleozoic era occurred during the Cambrian, approximately 7000 ppm (18 times higher than current measurements). During the Late Ordovic Period the CO2 concentration was approximately 12 times higher than the current ones, with a value of 4400 ppm. These high concentrations of CO2 favored the plants colonizing the continents and thus affecting the world climate.

To find the energy required to heat 1.00 kg of ethane from 25.0°C to 73.4°C, one must calculate the number of moles of ethane, determine the temperature change, and apply the formula Q = n • Cv • ΔT using the given specific heat capacity at constant volume (Cv).

The question pertains to the calculation of energy required for a temperature change in ethane (C2H6) and is based on thermodynamic principles involving heat, enthalpy, and specific heat capacities. To calculate the energy required to change the temperature of 1.00 kg of ethane from 25.0°C to 73.4°C in a rigid vessel, we need the specific heat capacity at constant volume (Cv) and the molar mass of ethane to convert the mass to moles. The energy, Q, needed for the temperature change is given by Q = n • Cv • ΔT, where n is the number of moles, and ΔT is the change in temperature.

First, calculate the number of moles (n) of ethane: its molar mass is 30.07 g/mol (add the atomic masses of 2 carbon atoms and 6 hydrogen atoms). Given that we have 1.00 kg (or 1000 g) of ethane, divide 1000 g by 30.07 g/mol to find n. Then, use ΔT = 73.4°C - 25.0°C to find the temperature change. Finally, plug these values into the equation Q = n • Cv • ΔT with the given Cv of 44.60 J/K·mol to calculate the required energy in joules.

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The energy required to change the temperature of 1.00 kg of ethane (C₂H₆) from 25.0°C to 73.4°C in a rigid vessel is 71622 J.

To calculate the energy required to change the temperature of 1.00 kg of ethane (C₂H₆) from 25.0°C to 73.4°C in a rigid vessel, we need to use the specific heat capacity at constant volume ([tex]C_v[/tex]) and the number of moles of ethane.

Given:

Step-by-Step Calculation

1. Convert the mass of ethane to moles:

[tex]n = \frac{m}{M}[/tex]

where

[tex]n = \frac{1000 \, \text{g}}{30.07 \, \text{g/mol}} \\\\n \approx 33.25 \, \text{mol}[/tex]

2. Calculate the temperature change:

[tex]\Delta T = T_2 - T_1 \\\\\Delta T = 73.4^\circ\text{C} - 25.0^\circ\text{C}\\\\\Delta T = 48.4 \, \text{K}[/tex]

3. Calculate the energy required using the formula:

[tex]Q = n \cdot C_v \cdot \Delta T[/tex]

where

[tex]Q = 33.25 \, \text{mol} \cdot 44.60 \, \text{J/K/mol} \cdot 48.4 \, \text{K}\\\\Q \approx 33.25 \cdot 44.60 \cdot 48.4\\\\Q \approx 71621.9 \, \text{J}[/tex]

So, the energy required to change the temperature of 1.00 kg of ethane from 25.0°C to 73.4°C in a rigid vessel is approximately:

[tex]Q \approx 71622 \, \text{J}[/tex]

The energy required is 71622 J.

Answer : The percentage aniline protonated is, 0.0209 %

Explanation :

First we have to calculate the pOH.

[tex]pH+pOH=14\\\\pOH=14-pH\\\\pOH=14-8.32\\\\pOH=5.68[/tex]

Now we have to calculate the hydroxide ion concentration.

[tex]pOH=-\log [OH^-][/tex]

[tex]5.68=-\log [OH^-][/tex]

[tex][OH^-]=2.09\times 10^{-6}M[/tex]

The equilibrium chemical reaction will be:

[tex]NH_3+H_2O\rightleftharpoons NH_4^++OH^-[/tex]

From the reaction we conclude that,

Concentration of [tex]OH^-[/tex] ion = Concentration of [tex]NH_4^+[/tex] ion = [tex]2.09\times 10^{-6}M[/tex]

Now we have to calculate the percentage aniline protonated.

[tex]\text{percentage aniline protonated}=\frac{2.09\times 10^{-6}M}{0.010M}\times 100[/tex]

[tex]\text{percentage aniline protonated}=0.0209\%[/tex]

Thus, the percentage aniline protonated is, 0.0209 %

Answer:

Explanation:

Sodium is a group 1 element with atomic number 1. It has 11 electrons. It is soft reactive metal. It has 1 valence electron.

Fluorine is a group 7 element, a hologen with 7 valence electron. It is a most reactive non metal.

When sodium react with fluorine, ionic bond is formed in the resulting compound sodium fluoride.

One sodium and fluorine each totaling 2 atoms are enough to make the bond.

As the bond is formed, both atoms have octet structure. That is they each have 8 electrons on their outermost shells.

The positive charge on sodium indicates that sodium had lost 1 electron to fluorine atom.

The negative charge on fluorine ion indicates that fluorine atom had gained 1 electron from sodium atom to form negative ion.

The name of the compound is sodium fluoride with formula NaF.

Answer:

The reaction of 1st group element Na and 7th group element F, results in formation of Sodium fluoride (NaF).

Explanation:

1. (a) Sodium (Na) is element belonging to the first group of the periodic table.        

(b) The atomic number of Na is 11 and after distribution it has 1 valence electron.

2. (a) Fluorine (F) is the halogen element and belongs to group 7 of the periodic table.

(b) The atomic number of F is 19 and it has 7 valence electrons.

3. The reaction of Na with F results in an ionic interaction with the formation of NaF (Sodium fluoride).

(a) The reaction and combination of Na and F is likely to be ionic in nature.

(b) The one valence electron of Na and F are involved in formation of bond. Total 2 electrons are involved.

4. (a) The successful formation of bond result in octet completion of NaF by sharing of electrons. Both the elements share 8 electrons, i.e. 7 electrons of F and 1 electron of Na.

(b) The +ve charge is imparted for the loss of electron . Na lost its 1 valence electron to F for bond formation and thus imparts the +ve charge.

(c) The -ve charge is imparted with the gain of electron. In reaction of Na with F, fluorine being more electronegative gains its electrons from Na and imparts a -ve charge.

(d) The reaction of Na with F results in the formation of compound known as sodium fluoride with the molecular formula NaF.

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Answer:

The answer to your question is 33.3 ml

Explanation:

Data

Stock solution 12M

Volume 2 = 200 ml

Concentration 2 = 2 M

Volume stock = ?

Process

1.- Use the formula for dilutions

                               C1V1 = C2 V2

- Solve for V1

                               V1 = C2V2 / C1

2.- Substitution

                               V1 = (2)(200) / 12

- Simplification

                               V1 = 400 / 12

3.- Result

                               V1 = 33.3 ml

4.- Conclusion

We need 33.3 ml of the concentrated solution.

The reactions Na3PO4+CoCl2,  Na2CO3+CuCl2 and CrCl2+Li2CO3 produce precipitates.

A precipitate is said to be formed when reaction of two aqueous solutions produces an insoluble product. The insoluble solid product separates from the solution and is called a precipitate.

The full reactions are written below;

Hence, the reactions;

Produce precipitates.

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To determine if a precipitate will form or not, we need to consult solubility rules. By analyzing the compounds in each reaction, we can determine whether they contain soluble or insoluble ions. Based on this analysis, we can classify each reaction as either forming a precipitate or not.

In order to determine if a precipitate will form or not, we need to consult solubility rules. According to the solubility rules, compounds containing Li+, Na+, K+, Rb+, Cs+, and NH4+ cations, as well as compounds containing NO3- and C2H3O2- anions, are generally soluble. On the other hand, compounds containing Cl-, Br-, I-, CO32-, and most O2- anions are insoluble, except when paired with the mentioned cations. By applying these rules, we can analyze each reaction:

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Final answer:

The cores of the Jovian planets are composed of a solid mixture of rocky and icy materials under great pressure, and their compositions are dominated by elements like carbon, nitrogen, and oxygen.

Explanation:

The cores of the jovian planets, such as Jupiter, Saturn, Uranus, and Neptune, are composed of a solid mixture of rocky and icy materials under great pressure.

This information is supported by studies of the gravitational fields of these planets and the fact that their compositions are dominated by elements like carbon, nitrogen, and oxygen, along with rock and ice.

Although the cores exist at pressures of tens of millions of bars, the materials referred to as 'rock' and 'ice' do not assume familiar forms at such extreme pressures and temperatures.

Answer:

Solution's mass = 200.055 g

[PbSO₄] = 275 ppm

Explanation:

Solute mass = 0.055 g of lead(II) sulfate

Solvent mass = 200 g of water

Solution mass = Solvent mass + Solution mass

0.055 g + 200 g = 200.055 g

ppm = μg of solute / g of solution

We convert the mass of solute from g to μg

0.055 g . 1×10⁶ μg/ 1g = 5.5×10⁴μg

5.5×10⁴μg / 200.055 g = 275 ppm

ppm can also be determined as mg of solute / kg of solution

It is important that the relation is 1×10⁻⁶

Let's verify: 0.055 g = 55 mg

200.055 g = 0.200055 kg

55 mg / 0.200055 kg = 275 ppm

Answer:

A) 10.75 is the concentration of arsenic in the sample in parts per billion .

B) 7,633.66 kg the total mass of arsenic in the lake that the company have to remove.

C) It will take 1.37 years to remove all of the arsenic from the lake.

Explanation:

A) Mass of arsenic in lake water sample = 164.5 ng

The ppb is the amount of solute (in micrograms) present in kilogram of a solvent. It is also known as parts-per million.

To calculate the ppm of oxygen in sea water, we use the equation:

[tex]\text{ppb}=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 10^9[/tex]

Both the masses are in grams.

We are given:

Mass of arsenic = 164.5 ng = [tex]164.5\times 10^{-9} g[/tex]

[tex]1 ng=10^{-9} g[/tex]

Volume of the sample = V = [tex]15.3 cm^3[/tex]

Density of the lake water sample ,d= [tex]1.00 g/cm^3[/tex]

Mass of sample =  M = [tex]d\times V=1.0 g/cm^3\times 15.3 cm^3=15.3 g[/tex]

[tex]ppb=\frac{164.5\times 10^{-9} g}{15.3 g}\times 10^9=10.75[/tex]

10.75 is the concentration of arsenic in the sample in parts per billion.

B)

Mass of arsenic in [tex]1 cm^3[/tex]  of lake water = [tex]\frac{164.5\times 10^{-9} g}{15.3}=1.075\times 10^{-8} g[/tex]

Mass of arsenic in [tex]0.710 km^3[/tex] lake water be m.

[tex]1 km^3=10^{15} cm^3[/tex]

Mass of arsenic in [tex]0.710\times 10^{15} cm^3[/tex] lake water :

[tex]m=0.710\times 10^{15}\times 1.075\times 10^{-8} g=7,633,660.130 g[/tex]

1 g = 0.001 kg

7,633,660.130 g = 7,633,660.130 × 0.001 kg=7,633.660130 kg ≈ 7,633.66 kg

7,633.66 kg the total mass of arsenic in the lake that the company have to remove.

C)

Company claims that it takes 2.74 days to remove 41.90 kilogram of arsenic from lake water.

Days required to remove 1 kilogram of arsenic from the lake water :

[tex]\frac{2.74}{41.90} days[/tex]

Then days required to remove 7,633.66 kg of arsenic from the lake water :

[tex]=7,633.66\times \frac{2.74}{41.90} days=499.19 days[/tex]

1 year = 365 days

499.19 days = [tex]\frac{499.19}{365} years = 1.367 years\approx 1.37 years[/tex]

It will take 1.37 years to remove all of the arsenic from the lake.

Answer:

Answer here is A: Transparent colour."

Explanation:

Hydrogen bonds here in water provides a lot of benefits which includes cohesion, releasing heat when forming, Also because of the fact that water molecules are polar, they form hydrogen molecules and give water some characteristics which ranges from high boiling point, relative gravity, adhesion ad also cohesion. It is also known that oxygen atom attracts the electrons more strongly than the hydrogen.

    A transparent colour falls in no place and do not really have any correlation in oxygen and hydrogen relationship.

Hydrogen bonding among water molecules gives water several important properties, including strong cohesion, high heat capacity, and the ability to serve as a solvent. However, it is not responsible for water's lower density as a solid compared to a liquid.

Hydrogen bonding plays a crucial role in giving water several important properties. It allows for strong cohesion among water molecules, which contributes to its high surface tension and capillary action. This cohesion is also responsible for water's ability to serve as a solvent for many other molecules. Additionally, hydrogen bonding gives water a high heat capacity, meaning it can absorb and release a large amount of heat without changing temperature significantly. However, hydrogen bonding is not responsible for water's lower density as a solid compared to a liquid. This unique property is a result of the structure of water molecules and the open lattice arrangement they form in ice.

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Polarity

Cohesion

Explanation:

One molecule of water joins with four other water molecule by hydrogen bonds. In a water molecule, one end has positive charge and the other end has negative charge. This difference in charge creates polarity in the molecule.

The cohesion of water molecules helps transport water from roots to the leaves in plants. Plants absorb water from the soil by osmosis. They absorb mineral ions by active transport, against the concentration gradient. Root hair cells are adapted for taking up water and mineral ions by having a large surface area to increase the rate of absorption.

Answer: Cohesion

Explanation:

Cohesion is a measure of how well molecules stick to each other. Water molecules is a typical example of Cohesion.

Hydrogen bonds are formed between each water molecule, enabling them stick to each other strongly. Due to this sticky nature of water molecules, they form droplets on surfaces (e.g dew drops) and a dome like-shape when filling a container just before it overflows.

Cohesion also produces Surface Tension; a phenomenon that makes it possible for light objects like needle to float when placed gently and insects to walk on water.

Also aided by capillary action (the movement of a liquid across the surface of a solid caused by adhesion between the two), Cohesion makes it possible for water to be taken as single huge molecule from Xylem in the roots of plant to its leaves.

Answer: Ionic compounds ( Metal + Non-metal), Covalent Compounds (Non-metal + Non metal ).

Explanation: Going by the definition, an ionic compound is formed when a chemical reaction occurs between a metal and a non-metal while a covalent compound is formed when a chemical reaction occurs between two non-metals.

Having a good knowledge of the periodic table, one can easily identify the metals and non-metals in each compound and thus tell if it is Ionic or Covalent.

By examining the formula of a chemical compound, one can tell if it is ionic or covalent. Ionic compounds consist of metals combined with nonmetals or polyatomic ions, whereas covalent compounds are formed from nonmetals only.

To determine if a chemical compound is ionic or covalent just by looking at the formula, we consider the types of elements involved in the compound. Typically, ionic compounds are formed when a metal and a nonmetal react, resulting in the transfer of electrons and the formation of ions. For example, NaCl (sodium chloride) is an ionic compound because it consists of the metal sodium (Na) and the nonmetal chlorine (Cl).

In contrast, covalent compounds are formed when nonmetals bond together, leading to the sharing of electrons. An example of a covalent compound is H2O (water), which comprises the nonmetals hydrogen (H) and oxygen (O). Also, if the compound contains a recognizable polyatomic ion like NO3− (nitrate), which typically forms ionic bonds with metals, it can be identified as ionic. For instance, Ba(NO3)2 includes the nitrate ion and the metal barium (Ba), indicating an ionic compound.

Answer:

the answer is b :)

Explanation:

Answer: B

Explanation:

I just had this question on Study Island.

Answer:

Kp = 8.76×10⁻³

Explanation:

We determine the carbamate decomposition in equilibrium:

NH₄CO₂NH₂ (s) ⇄ 2NH₃(g) + CO₂(g)

Let's build the expression for Kp

Kp = (Partial pressure NH₃)² . Partial pressure CO₂

We do not consider, the carbamate because it is solid and we only need the partial pressure from gases

Kp = (0.370atm)² . 0.0640 atm

Kp = 8.76×10⁻³

Remember Kp does not carry units

The value of the equilibrium constant Kp for the decomposition of ammonium carbamate at 40°C, given the partial pressures of 0.370 atm for NH3 and 0.0640 atm for CO2, is 0.0087616.

The decomposition of ammonium carbamate to ammonia and carbon dioxide at equilibrium can be represented by the following equation:

NH4CO2NH2(s) ⇌ 2 NH3(g) + CO2(g)

The equilibrium constant for a reaction involving gases, Kp, is based on the partial pressures of the gaseous products and reactants. The equilibrium constant expression for this reaction is:

Kp = (PNH3)^2 × (PCO2)

Given the equilibrium partial pressures, 0.370 atm of NH3 and 0.0640 atm of CO2, we can calculate the Kp value:

Kp = (0.370)^2 × (0.0640) = 0.1369 × 0.0640 = 0.0087616

So, the value of the equilibrium constant Kp for the reaction at 40°C is 0.0087616.

Answer: The corresponding value of [tex]K_p[/tex] for this reaction at 84.5°C is 0.00232

Explanation:

[tex]2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)[/tex]

Relation of with is given by the formula:

[tex]K_p=K_c(RT)^{\Delta ng}[/tex]

where,

= equilibrium constant in terms of partial pressure = ?

[tex]K_c[/tex] = equilibrium constant in terms of concentration = 0.0680

R = Gas constant = [tex]0.0821\text{ L atm }mol^{-1}K^{-1}[/tex]

T = temperature  =[tex]84.5^0C=(273+84.5)K=357.5K[/tex]

[tex]\Delta n_g[/tex] = change in number of moles of gas particles = [tex]n_{products}-n_{reactants}=2-3=-1[/tex]

Putting values in above equation, we get:

[tex]K_p=0.0680\times (0.0821\times 357.5)^{-1}\\\\K_p=0.00232[/tex]

Thus the corresponding value of [tex]K_p[/tex] for this reaction at 84.5°C is 0.00232

Bread dough rises due to the formation of gas.

Explanation:

The collapse point is an indicator of sufficient Bread dough rise.

Discussion;

When yeast is added to water and flour to create dough, it eats up the sugars in the flour and in turn produces carbon dioxide gas and ethanol in a process termed fermentation.

The elastic protein, gluten in the dough traps the carbon dioxide gas, preventing it from escaping.

In essence, the bread volume increases as the dough rises.

The collapse point is an indicator of sufficient dough rise.

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The molar mass of the gas is 77.20 gm/mole.

Explanation:

The data given is:

P = 3.29 atm,   V= 4.60 L   T= 375 K  mass of the gas = 37.96 grams

Using the ideal Gas Law will give the number of moles of the gas. The formula is

PV= nRT    (where R = Universal Gas Constant 0.08206 L.atm/ K mole

Also number of moles is not given so applying the formula

n= mass ÷ molar mass of one mole of the gas.

n = m ÷ x   ( x  molar mass) ( m mass given)

Now putting the values in Ideal Gas Law equation

PV = m ÷ x RT

3.29 × 4.60 = 37.96/x × 0.08206 × 375

15.134 = 1168.1241  ÷ x

15.134x = 1168.1241

x = 1168.1241 ÷ 15.13

x = 77.20 gm/mol

If all the units in the formula are put will get cancel only grams/mole will be there. Molecular weight is given by gm/mole.

Answer:

77.2

Explanation:

Answer: Boyle's law states that gas volume is inversely proportional to pressure.

Explanation:

Boyle's law is one of the law used to determine the Ideal Gas equation.

This law states that pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles

Mathematically,

[tex]P\propto \frac{1}{V}[/tex]          (at constant temperature and number of moles)

The above expression can also be written as:

[tex]P_1V_1=P_2V_2[/tex]

where,

[tex]P_1\text{ and }V_1[/tex] are initial pressure and volume of the gas

[tex]P_2\text{ and }V_2[/tex] are final pressure and volume of the gas

Hence, Boyle's law states that gas volume is inversely proportional to pressure.

Boyle's law states that at constant temperature, the volume of a fixed amount of gas is inversely proportional to its pressure. Thus, if the pressure on a gas increases, its volume decreases, and vice versa. This relationship is crucial for understanding gas behavior.

Boyle's law states that the volume of a given amount of gas held at constant temperature is inversely proportional to the pressure under which it is measured. This means if the pressure on a gas increases, its volume decreases, as long as the temperature and the amount of gas remain constant, and vice versa.

If we express this relationship mathematically:

V ∝ 1/P or PV = k (where k is a constant)

For example, if you double the pressure on a gas, its volume will decrease by half, provided the temperature stays the same. This principle is essential in understanding the behavior of gases in various conditions.

Answer:

0.03429 mole

Explanation:

The type of acid present in the stomach is hydrochloric acid (HCl).

From the balanced equation:

[tex]Mg(OH)_2 + 2HCl --> MgCl_2 + 2H_2O[/tex]

2 moles of HCl requires 1 mole of Mg(OH)2 fro complete neutralization.

moles of Mg(OH)2 present in 1g = mass/molar mass

                                                            = 1/58.33 = 0.01714 mole

If 1 mole of Mg(OH)2 is needed for 2 moles of HCl, then

0.01714 mole of Mg(OH)2 will require: 2 x 0.01714 moles HCl

= 0.03429 mole of HCl

Hence, 0.03429 mole of stomach acid can be neutralized by 1.00g of Mg(OH)2

Answer:

the correct words to fill up the blank spaces are falls and money

Explanation:

.1. the expected return on money falls

.2. causing the demand for money to fall.

The question is incomplete. complete question is;

A 0.10 mol sample of each of the four species in the reaction represented above is injected into a rigid, previously evacuated 1.0 L container. Which of the following species will have the highest concentration when the system reaches equilibrium?

[tex]2H_2S+CH_4\rightleftharpoons CS_2(g)+4H_2(g)[/tex]

[tex]K_c=3.4\times 10^{-4}[/tex]

a.[tex]H_2S(g) [/tex]

b.[tex]CH_4(g) [/tex]

c.[tex]CS_2(g) [/tex]

d.[tex]H_2(g)[/tex]

Answer:

The correct answer is option a.

Explanation:

[tex]2H_2S+CH_4\rightleftharpoons CS_2(g)+4H_2(g)[/tex]

The equilibrium constant of the reaction= [tex]K_c=3.4\times 10^{-4}[/tex]

Concentration of the species initially:

[tex][H_2S]=\frac{0.10 mol}{1.0 L}=0.10 M[/tex]

[tex][CH_4]=\frac{0.10 mol}{1.0 L}=0.10 M[/tex]

[tex][CS_2]=\frac{0.10 mol}{1.0 L}=0.10 M[/tex]

[tex][H_2]=\frac{0.10 mol}{1.0 L}=0.10 M[/tex]

The equilibrium quotient of the reaction is :

[tex]Q_c=\frac{[CS_2][H_2]^4}{[H_2S]^2[CH_4]}[/tex]

[tex]=\frac{(0.10M)(0.10 M)^4}{(0.10 M)^2(0.10 M)}=0.01[/tex]

[tex]Q_c>K_c[/tex] (reaction will go backward)

[tex]2H_2S+CH_4\rightleftharpoons CS_2(g)+4H_2(g)[/tex]

Initially

0.10 M    0.10 M    0.10 M    0.10 M

At Equilibrium :

(0.10+2x) M    (0.10+x) M    (0.10-x) M    (0.10-4x) M

[tex]K_c=\frac{[CS_2][H_2]^4}{[H_2S]^2[CH_4]}[/tex]

[tex]3.4\times 10^{-4}=\frac{(0.10-x)(0.10-4x)^4}{(0.10+2x)^2(0.10+x)}[/tex]

Solving formx:

x = 0.099 M

As we can see that from the reaction at equilibrium, the concentration of hydrogen sulfide will be highest:

[tex]=[H_2S]=(0.10+2x) M=(0.10+2\times 0.099) M=0.298 M[/tex]

The highest concentration at equilibrium has been of hydrogen sulfide. Thus, option A is correct.

The moles of reactants in the reaction has been 0.10 mol for each reactant. The balanced equation for the reaction has been:

[tex]\rm 2\;H_2S\;+\;CH_4\;\leftrightharpoons CS_2\;+\;4\;H_2[/tex]

The equilibrium quotient Q, for the reaction, has been given as:

[tex]Q=\dfrac{[CS_2]\;[H_2]^4}{[H_2S]^2\;[CH_4]}[/tex]

The equilibrium concentration of the reaction has been given in the image attached.

The initial value of equilibrium quotient, Qi has been:

[tex]Q_i=\dfrac{[0.1]\;\times\;[0.1]^4}{[0.1]^2\;[0.1]} \\Q_i=0.01[/tex]

The initial value of equilibrium quotient has been 0.01.

The equilibrium quotient, Ke value for equilibrium concentration:

[tex]3.4\;\times\;10 ^-^4=\dfrac{[0.10-x]\;[0.10-4x]^4}{[0.10+2x]^2\;[0.10 +x]} \\x=0.099\;M[/tex]

The concentration of compounds at equilibrium has been highest for hydrogen sulfide that is 0.298 M.

Thus, the highest concentration at equilibrium has been of hydrogen sulfide. Thus, option A is correct.

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Answer:

Answers are in the explanation

Explanation:

An acid-base equation in general is the reaction between an acid and a base that produce water and a salt. Thus:

a) HClO₄(aq) + LiOH(aq) → LiClO₄(aq) + H₂O(l)

   Acid     + Base → Salt      + Water

b) H₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l)

   Acid     + Base     →   Salt      + Water

c) 2HF(g) + Ba(OH)₂(s) → BaF₂ + 2H₂O

   Acid     + Base → Salt      + Water

I hope it helps!

Answer:

Solution with a pH = 1

Explanation:

So the pH equation is pH = -log[H+]. To get the [H+] (hydrogen ion concentration), you rearrange to get [H+] = 10^-pH.

Solution with a pH = 1 ,  [H+] = .1 M

Solution with a pH = 12 , [H+] = 1*10^-12 M

Solution with a pH = 7 ,  [H+] = 1*10^-7 M

Solution with a pH = 9 ,  [H+] = 1*10^-9 M

Solution with a pH = 5,  [H+] = 1*10^-5 M

Another way to get the answer: a high hydrogen ion concentration means that the solution should be more acidic. The most acidic pH of the 5 solutions is the one with a pH = 1.

Final answer:

The solution with a pH of 1 would have the highest hydrogen ion concentration, indicating it is the most acidic among the given options.

Explanation:

Out of the provided pH values, which solution would have the highest concentration of hydrogen ions? An indicator of how basic or acidic a solution is is the pH scale. High pH solutions are more basic, whereas low pH solutions are more acidic.

Because the pH scale is logarithmic, every pH value below 7 is ten times more acidic than the value immediately above it. For the options given, a pH of 1 indicates the highest acidity, implying the highest hydrogen ion concentration. This is due to the following relationship: pH = -log[H₃O⁺], where [H₃O⁺] represents the hydrogen ion concentration.

Therefore, a solution with a pH of 1 has a hydrogen ion concentration of 1.0 x 10⁻¹M, and is acidic.

Answer: The decay process of the radioisotopes are written below.

Explanation:

For the given options:

Alpha decay is defined as the process in which the nucleus of an atom disintegrates into two particles. The first one which is the alpha particle consists of two protons and two neutrons, also known as helium nucleus. The second particle is the daughter nuclei which is the original nucleus minus the alpha particle released.

[tex]_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\alpha[/tex]

The chemical equation for the alpha decay process of Ra-226 isotope follows:

[tex]_{88}^{226}\textrm{Ra}\rightarrow _{86}^{222}\textrm{Rn}+_2^4\alpha[/tex]

Beta decay is defined as the process in which the neutrons get converted into an electron and a proton. The released electron is known as the beta particle. In this process, the atomic number of the daughter nuclei gets increased by a factor of 1 but the mass number remains the same.

[tex]_Z^A\textrm{X}\rightarrow _{Z+1}^{A}\textrm{Y}+_{-1}^0\beta[/tex]

The chemical equation for the alpha decay process of Pb-214 isotope follows:

[tex]_{82}^{214}\textrm{Pb}\rightarrow _{83}^{214}\textrm{Bi}+_{-1}^0\beta[/tex]

Hence, the decay process of the radioisotopes are written above.

Answer:

D. her results are neither precise, nor accurate

Explanation:

Reason being that: First, she obtained four different result for an experiment ( obviously it's supposed to be one value for the different procedure or atleast very close range) sugar solution and all four values were far apart.

Final answer:

The student's density measurements of a sugar solution were neither precise nor accurate because they varied widely from each other and, except one value, they also differed significantly from the known actual density value.

Explanation:

When a student performs an experiment to determine the density of a sugar solution and obtains results that vary greatly from the actual value, we must assess the precision and accuracy of the measurements. Accuracy refers to how close each measurement is to the true value, in this case, the actual density of 1.75 g/mL. Precision indicates how close the measurements are to each other, regardless of how close they are to the actual value.

In this scenario, the student's results show one measurement that is the same as the known actual value (1.75 g/mL), suggesting a single instance of accuracy. Therefore, the statement that best describes the student's results is that they are neither precise nor accurate, which corresponds to option D.

Explanation:

Compositing is the regulated breakdown of organic matter by microbes, aerobically. The major gas released from composting is carbon dioxide. This is different from landfills and manure piles where most of the breakdown of the organic matter happens, anaerobically because less oxygen penetrates the matter. Composting involves deliberate aeration of the decomposing matter. Anaerobic breakdown methane releases methane gas even more than carbon dioxide. Methane is four times more potent as a greenhouse gas than carbon dioxide. This is why composting is a good agricultural practice for mitigating climate change as compared to the use of landfills.

Answer:

Composting reduces the waste going to the landfill, which can lower methane emissions. It also promotes the growth of new plants and trees, which control the CO2 levels in the air. Mark could ask these two questions at the meeting:

What types of food waste will be composted?

How will the compost be used in the community?

Explanation:

This is the sample answer on edmentum

Answer:

In a closed system the vapor pressure and the measured pressure of a gas increases.

Explanation:

as the pressure of the liquid increases the measured pressures also increases  with a given temperature.

Final answer:

The average rate of the reaction is -0.005 M/min.

Explanation:

The average rate of a reaction can be calculated by using the change in concentration of a reactant or product divided by the time interval. In this case, the concentration of NO changed from 0.100 M to 0.025 M in 15 minutes. You can calculate the average rate of the reaction by dividing the change in concentration by the time interval:

Average rate = (Final concentration - Initial concentration) / Time

Average rate = (0.025 M - 0.100 M) / 15 minutes

Average rate = -0.075 M / 15 minutes = -0.005 M/min

Final answer:

To calculate the percent by mass of each element in a compound, divide the mass of each element in one mole by the total molar mass of the compound and multiply by 100. The sum of the percentages for all elements should equal 100% for a pure compound.

Explanation:

To determine the percent by mass of each element in a compound, one needs to carry out a series of calculations. First, you should find the mass of each element in one mole of the compound by using the compound's chemical formula and the atomic masses of the elements (this can be found on the periodic table). Then, divide this mass by the compound's molar mass (which is the sum of all the atomic masses from the chemical formula) and multiply the result by 100 to get the percentage. The sum of these percentages for all elements in the compound should be 100%, assuming the compound is pure.

True.

The percent by mass of an element in a compound can be calculated by dividing the molar mass of that element by the total molar mass of the compound and then multiplying by 100 to express it as a percentage. This calculation gives the proportion of the compound's mass that is attributed to a specific element.

True. To find the percent by mass of an element in a compound, you can use the formula:

[tex]\[ \text{Percent by Mass} = \left( \frac{\text{Molar Mass of Element}}{\text{Total Molar Mass of Compound}} \right) \times 100 \][/tex]

Here's how it works: For each element in the compound, calculate its molar mass (the mass of one mole of atoms of that element). Then, add up the molar masses of all the elements in the compound to find the total molar mass of the compound. Finally, apply the formula by taking the molar mass of the specific element and dividing it by the total molar mass of the compound. Multiply the result by 100 to express the ratio as a percentage. This calculation helps determine the relative abundance of each element in the compound based on their masses.

The probable question may be:

To find the percent by mass of a compound if you are given the formula, divide the molar mass of that element in one mole of the compound by the total molar mass of the compound, multiplied by 100.

True/False.