Chapter 14, Problem 14.106QP

The following reaction is important in the manufacture of sulfuric acid.

${\text{SO}}_2(g)+\frac{1}{2}{\text{O}}_2(g)\stackrel{}{\rightleftharpoons }{\text{SO}}_3(g)$

At 900 K, 0.0216 mol of SO₂ and 0.0148 mol of O₂ are sealed in a 1.00-L reaction vessel. When equilibrium is reached, the concentration of SO₃, is determined to be 0.0175 M. Calculate K_c for this reaction.