In a gas phase equilibrium mixture of PCl5, PCl3 and Cl2 at 500 K, the partial pressures of PCl5 and Cl2 are P(PCl5) = 0.15 atm, and P(Cl2) = 0.20 atm. Kp = 25 for the equilibrium   PCl5(g)  ⇌  PCl3(g)  +  Cl2(g) What is P(PCl3)?

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