The equilibrium constant K = 0.36 for the reaction PCI5(g) ⇌ PCI3(g) + Cl2(g) at 400 K. (a) Given that 1.5 g of PCI5 was initially placed in a reaction vessel of volume 250 cm3, determine the molar concentrations in the mixture at equilibrium. (b) What is the percentage of PCI5 decomposed at 400 K?

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