Problem: Phosphorus pentachloride decomposes according to the chemical equation PCl5 (g) ⇌ PCl3 (g) + Cl2(g)                 K c = 1.80 at 250 °C.A 0.162 mol sample of PCl5 (g) is injected into an empty 2.10 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5 (g) and PCl3 (g) at equilibrium. 

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Phosphorus pentachloride decomposes according to the chemical equation 

PCl5 (g) ⇌ PCl3 (g) + Cl2(g)                 K c = 1.80 at 250 °C.

A 0.162 mol sample of PCl5 (g) is injected into an empty 2.10 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5 (g) and PCl3 (g) at equilibrium.