The equilibrium constant, Kp, for the following reaction is 0.497 at 500K. PCI5(9) PCI3(g) + Cl2(g) If an equilibrium mixture of the three gases in a 18.2 L container at 500K contains PCI5 at a pressure of 0.446 atm and PCI3 at a pressure of 0.264 atm, the equilibrium partial pressure of Cl2 is atm.

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