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In a 5 L vessel, 2 mol CO and 3 mol Cl2 react to equilibrium: CO(g) + Cl2(g) <=> COCl2(g). If 1 mol CO remains at equilibrium, find Kc.

1. 4
2. 3
3. 2
4. 2.5

Correct answer: 2.5

Solution

1 mol CO reacts, leaving CO = 1, Cl2 = 2, COCl2 = 1 mol; with V = 5 L, Kc = 0.2/(0.2*0.4) = 2.5.

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