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+Cl2 (double arrow) COCl2 Carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 464 degrees C . At equilibrium, the concentrations were measured and the following results obtained: Gas Partial Pressure (atm) CO 0.900 Cl2 1.14 COCl2 0.140 What is the equilibrium constant, Kp , of this reaction?

Explanation / Answer

CO(g) + Cl2(g) (double arrow) COCl2(g)

At equilibrium,

PCO= 0.900 atm

PCl2 = 1.14 atm

PCOCl2 = 0.140 atm , where P represents partial pressure of the gases at equilibrium

Now,

Kp = PCOCl2/(PCO x PCl2)

= 0.140 atm/(0.900 atm x 1.14 atm) = 0.13645 atm-1

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