   Chapter 15, Problem 2PS

Chapter
Section
Textbook Problem

Write equilibrium constant expressions for the following reactions. For gases, use either pressures or concentrations. (a) 3 O2(g) ⇄ 2 O3(g) (b) Fe(s) + 5 CO(g) ⇄ Fe(CO)5(g) (c) (NH4)2CO3(s) ⇄ 2 NH3(g) + CO2(g) + H2O(g) (d) Ag2SO4(s) ⇄ 2 Ag+(aq) + SO42−(aq)

(a)

Interpretation Introduction

Interpretation: The equilibrium constant for the given reaction has to be identified.

Concept Introduction: At equilibrium the concentration of the reaction and the product is equated to a constant K, where K is known as the equilibrium

If a reaction is as aA+bBcC+dD ,

The equilibrium constant K=[C]c[D]d[A]a[B]b

Explanation

The equilibrium constant for the reaction can be calculated as,

3O2(g)2O3(g)

The product concentrations appear in the numerator and reactant concentrations appear in the denominator. Each concentration should be raised to a power equal to the stoichiometric coefficient in the balanced equation.

The equilibrium constant for the above reaction is given below,

Kc=[O3]2

(b)

Interpretation Introduction

Interpretation: The equilibrium constant for the given reaction has to be identified.

Concept Introduction: At equilibrium the concentration of the reaction and the product is equated to a constant K, where K is known as the equilibrium

If a reaction is as aA+bBcC+dD ,

The equilibrium constant K=[C]c[D]d[A]a[B]b

(c)

Interpretation Introduction

Interpretation: The equilibrium constant for the given reaction has to be identified.

Concept Introduction: At equilibrium the concentration of the reaction and the product is equated to a constant K, where K is known as the equilibrium

If a reaction is as aA+bBcC+dD ,

The equilibrium constant K=[C]c[D]d[A]a[B]b

(d)

Interpretation Introduction

Interpretation: The equilibrium constant for the given reaction has to be identified.

Concept Introduction: At equilibrium the concentration of the reaction and the product is equated to a constant K, where K is known as the equilibrium

If a reaction is as aA+bBcC+dD ,

The equilibrium constant K=[C]c[D]d[A]a[B]b

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