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Part A Phosgene (carbonyl chloride), COCl 2 , is an extremely toxic gas that is

ID: 903174 • Letter: P

Question

Part A

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 C. At equilibrium, the concentrations were measured and the following results obtained:

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

Gas Partial Pressure
(atm) CO 0.750 Cl2 1.29 COCl2 0.270

Explanation / Answer

Kp =(PCOCl2)/PCO x PCl2 = 0.270/0.75 x 1.29 = 0.279

Kp = 0.279.

Kc=Kp/(RT)n =0.279 / (0.0821 x 746)-1 = 17.087

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