1. Phosgene (carbonyl chloride), COCl2, is an extremely toxic gas that is used i

Question

1. 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 476 C . At equilibrium, the concentrations were measured and the following results obtained: Gas Partial Pressure (atm)

CO 0.720

Cl2 1.20

COCl2 0.220

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

2. The following reaction was performed in a sealed vessel at 761 C :

H2(g)+I2(g)2HI(g)

Initially, only H2 and I2 were present at concentrations of [H2]=3.95M and [I2]=2.65M. The equilibrium concentration of I2 is 0.0900 M . What is the equilibrium constant, Kc, for the reaction at this temperature?

Express your answer numerically.

Explanation / Answer

      CO(g)+Cl2(g)COCl2(g)

Kp   = PCOCl2]/PCOPCl2

PCO   = 0.72atm

PCl2    = 1.2atm

PCOCl2   = 0.22atm

Kp   = PCOCl2/PCOPCl2

      = 0.22/0.72*1.2   = 0.254atm

2.   

         H2(g)   +   I2(g)      2HI(g)

I    3.95            2.65             0

C -0.09            -0.09         + 2*0.09

E   3.86             2.56            0.18

[HI]    = 0.18M

[H2] = 3.86M

[I2]   = 2.56M

Kc    = [HI]2/[H2][I2]

       = (0.18)2/3.86*2.56   = 0.003278 >>>> answer

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