Problem: 2.0 mol each of PCl5, PCl3, and Cl2 are placed in a 2.0L reaction vessel at 620K. Kc for the reaction PCl5(g) ⇌ PCl3(g) + Cl2(g) is 0.60 at the given temperature. What is the equilibrium concentration of Cl2?

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2.0 mol each of PCl5, PCl3, and Cl2 are placed in a 2.0L reaction vessel at 620K. Kc for the reaction 

PCl5(g) ⇌ PCl3(g) + Cl2(g) 

is 0.60 at the given temperature. What is the equilibrium concentration of Cl2?

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