A mixture of 0.2000 mol of CO2, 0.1000 mol of H2, and 0.1600 mol of H2O is placed in a 2.000 L vessel. The following equilibrium is established at 500 K:

CO2 (g) + H2 (g) ↔ CO (g) + H2O (g)

At equilibrium PH2O = 3.69 atm. Calculate Kp.