Phosphorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to the reaction: PCl3(g) + Cl2(g) → PCl5(g). An equilibrium mixture at 450 K contains the following: PPCl3 = 0.202 atm PCl2 = 0.256 atm PPCl5 = 3.45 atm What is the value of Kp at this temperature?

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