Chapter 14, Problem 14.64QP

Sulfur trioxide, used to manufacture sulfuric acid, is obtained commercially from sulfur dioxide.

$2{\text{SO}}_2(g)+{\text{O}}_2(g)\stackrel{}{\rightleftharpoons }2{\text{SO}}_3(g)$

The equilibrium constant K_c for this reaction is 4.17 × 10⁻² at 727°C. What is the direction of reaction when a mixture that is 0.80 M SO₂. 0.60 M O₂, and 0.10 M SO₃ approaches equilibrium at 727°C?