   Chapter 15, Problem 5PS

Chapter
Section
Textbook Problem

A mixture of SO2, O2, and SO3 at 1000 K contains the gases at the following concentrations: [SO2] = 5.0 × 10−3 mol/L, [O2] = 1.9 × 10−3 mol/L, and [SO3] = 6.9 × 10−3 mol/L. Is the reaction at equilibrium? If not, which way will the reaction proceed to reach equilibrium?2 SO2(g) + O2(g) ⇄ 2 SO3(g) Kc = 279

Interpretation Introduction

Interpretation:

The given reaction is in equilibrium or not has to be determined and way to proceed to reach equilibrium has to be identified.

Concept Introduction: For a reaction, aA+bBcC+dD ,

The reaction quotient,Q=[C]c[D]d[A]a[B]b

Q<K, means some reactants must convert to products for the reaction to reach equilibrium. This will decrease concentration of the reactant and will increase concentration of the products.

Q>K, means some products must convert to reactants for the reaction to reach equilibrium. This will increase concentration of the reactant and will decrease concentration of the products.

Explanation

Given Kc=279

The reaction quotient,Q=(5.0×10-3mol/L)2(1.9×10-3mol/L)(6.9×10-3mol/L)2= 9

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