Phosphorus trichloride and phosphorus pentachloride equilibrate in the presence of chlorine: PCl3 (g) + Cl2 (g) ? PCl5 (g). At equilibrium, the pressures of the individual species are as follows: 0.202 atm for PCl3 (g), 3.45 atm for PCl5 (g) and 0.256 atm for Cl2 (g). What is the value of KP for this reaction