Chapter 13, Problem 110CP

A sample of iron(II) sulfate was heated in an evacuated container to 920 K, where the following reactions occurred:

$\begin{array}{ll}2{\text{FeSO}}_4\left(s\right)\hfill & \rightleftharpoons {\text{Fe}}_2{\text{O}}_3\left(s\right)+{\text{SO}}_3\left(g\right)+{\text{SO}}_2\left(g\right)\hfill \\ {\text{SO}}_3\left(g\right)\hfill & \rightleftharpoons {\text{SO}}_2\left(g\right)+\frac{1}{2}{\text{O}}_2\left(g\right)\hfill \end{array}$

After equilibrium was reached, the total pressure was 0.836 atm and the partial pressure of oxygen was 0.0275 atm. Calculate K_p for each of these reactions.