Problem: Phosphorus pentachloride decomposes according to the chemical equation PCI5(g) ⇌ PCI3(g) + Cl2(g)         Kc = 1.80 at 250°C A 0.250 mol sample of PCI5(g) is injected into an empty 2.90 L reaction vessel held at 250°C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium. [PCl5] = [PCl3] =

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Phosphorus pentachloride decomposes according to the chemical equation 

PCI5(g) ⇌ PCI3(g) + Cl2(g)         Kc = 1.80 at 250°C 

A 0.250 mol sample of PCI5(g) is injected into an empty 2.90 L reaction vessel held at 250°C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium. 

[PCl5] = 

[PCl3] =