   Chapter 12, Problem 54QAP Chemistry: Principles and Reactions

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

Solutions

Chapter
Section Chemistry: Principles and Reactions

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

Consider the following hypothetical reaction: X 2 ( g ) + R ( s ) ⇌ X 2 R ( g ) R has a molar mass of 73 g/mol. When equilibrium is established, a 2.5-L reaction vessel at 125°C contains 15.0 g of R, 4.3 atm of X2, and 0.98 atm of X2R.(a) Calculate K for the reaction at 125°C.(b) The mass of R is doubled. What are the partial pressures of X2 and X2R when equilibrium is reestablished?(c) The partial pressure of X2 is decreased to 2.0 atm. What are the partial pressures of X2 and X2R when equilibrium is reestablished?

Interpretation Introduction

(a)

Interpretation:

The equilibrium constant for the reaction at given temperature 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 equilibrium 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 equilibrium reaction is shown as follows:

X2(g)+R(s)X2R(g)

At equilibrium, the partial pressure of X2 and X2R is 4.3 atm and 0

Interpretation Introduction

(b)

Interpretation:

The partial pressure of X2 and X2R 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 equilibrium 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.

Interpretation Introduction

(c)

Interpretation:

The partial pressure of X2 and X2R needs to be determined when partial pressure of X2 is decreased to 2.0 atm and new equilibrium is established.

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 equilibrium 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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