Chapter 14, Problem 76E

At a given temperature, a system containing O₂(g) and some oxides of nitrogen can be described by me reactions:

$\text{2 NO}\left(g\right)+{\text{O}}_{\text{2}}\left(g\right) \rightleftharpoons {\text{2 NO}}_{\text{2}}\left(g\right) K_{\text{P}}=\text{1}{0}^{\text{4}}$

${\text{2 NO}}_{\text{2}}\left(g\right) \rightleftharpoons {\text{N}}_{\text{2}}{\text{O}}_{\text{4}}\left(g\right) K_{\text{P}}=0.10$

A pressure of 1 atm of N₂O₄ (g) is placed in a container at this temperature. Predict which, if any, component (other than N₂O₄) is present at a pressure greater than 0.2 atm at equilibrium.