A Sample of 3

A sample of 3.00 x 10^-1 mole of pure phosgene gas, COCl₂, was placed in a 15.0 L container and heated to 800ºK. At equilibrium, the partial pressure of CO was found to be 0.497 bar. Calculate the equilibrium constant for the following reaction:COCl_{2 (g)} CO _(g) + Cl_{2 (g)}