Chapter 8, Problem 8.48E

A mixture of the gases $\text{NOCl}$, ${\text{Cl}}_{\text{2}}$ and $\text{NO}$ is allowed to reach equilibrium at $25°\text{C}$. The measured equilibrium concentrations are $\left[\text{NO}\right]=0.92\text{mol}/\text{L}$, $\left[\text{NOCl}\right]=1.31\text{mol}/\text{L}$ and $\left[{\text{Cl}}_2\right]=0.\text{20}\text{mol}/\text{L}$. What is the value of equilibrium constant at $25°\text{C}$ for the reaction

$\text{2NOCl}\left(\text{g}\right)\rightleftarrows 2\text{NO}\left(\text{g}\right)+{\text{Cl}}_{\text{2}}\left(\text{g}\right)$