Phosgene (carbonyl chloride), COCl2, is an extremely toxic gas that is used in m

Question

Phosgene (carbonyl chloride), COCl2, is an extremely toxic gas that is used in manufacturing certain dyes and plastics. Phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures:

CO(g) + Cl2(g) COCl2(g)

Carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 473 degrees C. At equilibrium, the concentrations were measured and the following results obtained:

Gas Partial Pressure (atm)

CO 0.850

Cl2 1.13

COCl2 0.240

What is the equilibrium constant, Kp, of this reaction?

Explanation / Answer

If the pressure are given already in equilibrium, we just need:

Kp = Pproducts / Preactants

Kp = P-COCl2 / (P-CO) ( P-Cl2)

substitute data:

Kp = (0.24) / (0.85*1.13)

Kp = 0.2498698

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