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Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
ISBN: 9781305079373

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Chapter
Section
BuyFindarrow_forward

Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
ISBN: 9781305079373
Textbook Problem

When one mole of carbon disulfide gas reacts with hydrogen gas, methane and hydrogen sulfide gases are formed. When equilibrium is reached at 900°C, analysis shows that P CH 4 = 0.0833 atm, P H 2 S = 0.163 atm, P CS 2 = 1.27 atm, and P H 2 = 0.873 atm.

(a) Write a balanced equation (smallest whole-number coefficients) for the reaction.

(b) Find K at 900°C.

Interpretation Introduction

(a)

Interpretation:

A balanced chemical equation for the given reaction needs to be determined.

Concept introduction:

The system is said to be in equilibrium if the there is no change in the partial pressure or concentration of reactant and product takes place.

For a general reaction as follows:

A(g)+B(g)C(g)+D(g)

The expression for the equilibrium constant is represented as follows:

K=(PC)(PD)(PA)(PB)

Here, to calculate the equilibrium constant, the values of partial pressure of all the species in reactant and product side are required.

Explanation

The reaction of 1 mol of carbon disulfide gas and hydrogen gas results in the formation of methane and hydrogen sulfide gas.

The chemical equation for the reaction will be:

CS2(g)+H2(g)CH4(g)+H2S(g)

To balance the above chemical equation, give coefficient 2 to H2S and 4 to H2 thus,

CS2(g

Interpretation Introduction

(b)

Interpretation:

The value of equilibrium constant for the reaction needs to be determined.

Concept introduction:

The system is said to be in equilibrium if the there is no change in the partial pressure or concentration of reactant and product takes place.

For a general reaction as follows:

A(g)+B(g)C(g)+D(g)

The expression for the equilibrium constant is represented as follows:

K=(PC)(PD)(PA)(PB)

Here, to calculate the equilibrium constant, the values of partial pressure of all the species in reactant and product side are required.

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