Part A Phosgene (carbonyl chloride), COCl2, is an extremely toxic gas that is us

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

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

In Part A, you were given the equilibrium pressures, which could be plugged directly into the formula for K. In Part B however, you will be given initial concentrations and only one equilibrium concentration. You must use this data to find all three equilibrium concentrations before you can apply the formula for K.

Part B

The following reaction was performed in a sealed vessel at 722 C :

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

Initially, only H2 and I2 were present at concentrations of [H2]=3.00M and  [I2]=2.95M. The equilibrium concentration of I2 is 0.0200 M . What is the equilibrium constant, Kc, for the reaction at this temperature?

Gas Partial Pressure
(atm) CO 0.780 Cl2 1.17 COCl2 0.190

Explanation / Answer

Answer -

Answer – Part A) We are given the equilibrium partial pressure of each in the following reaction –

CO(g) + Cl2(g) <-----> COCl2(g)

Gas

Partial Pressure
(atm)

CO

0.780

Cl2

1.17

COCl2

0.190

We know the equ8ilibrium constant, Kp expression

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

      = 0.190 / 0.780 * 1.17

      = 0.208

Part B) We are given, Initial [H2] = 3.0 M, [I2] = 2.95 M, at equilibrium, [I2] = 0.0200 M

We need to put ICE table

       H2 (g) + I2 (g) <-----> 2 HI (g)

I    3.0        2.95                   0

C   -x         -x                 +2x

E 3.0-x    0.0200               +2x

at equilibrium, [I2] = 2.95-x = 0.0200 M

so, x = 2.93 M

so at equilibrium,

[H2] = 3.0 – x

         = 3.0 -2.93

         = 0.0700 M

[HI] = 2x

      = 2*2.93

       = 5.86 M

We know,

Kc = [HI(g)]2 / [H2 (g)] [I2 (g)]

      = (5.86)2 / (0.0700) *(0.0200)

       = 2.45*104

Gas

Partial Pressure
(atm)

CO

0.780

Cl2

1.17

COCl2

0.190

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