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Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) <-> PCl3 (g) + Cl2(g) Kc = 1.80 at 250 C. A 0.442 mol sample of PCl5(g) is injected into an empty 4.60 L reaction vessel held at 250 C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium