Chapter 14.4, Problem 9PE

Consider the reaction in Example 14.9. Starting with a concentration of 0.040 M for HI, calculate the concentrations of HI, H₂, and I₂ at equilibrium.

Example 14.9

A mixture of 0.500 mol H₂ and 0.500 mol I₂ was placed in a 1.00-L stainless-steel flask at 430°C. The equilibrium constant K_c for the reaction ${\text{H}}_2(g)+{\text{I}}_{\text{2}}(g)\rightleftharpoons \text{2HI}(g)$ is 54.3 at this temperature. Calculate the concentrations of H₂, I₂, and HI at equilibrium.