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 474 C . At equilibrium, the concentrations were measured and the following results obtained: Gas Partial Pressure (atm) CO 0.900 Cl2 1.12 COCl2 0.270 What is the equilibrium constant, Kp, of this reaction? Express your answer numerically.

Part B

The following reaction was performed in a sealed vessel at 719 C :

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

Initially, only H2 and I2 were present at concentrations of [H2]=3.30M and [I2]=3.00M. The equilibrium concentration of I2 is 0.0200 M . What is the equilibrium constant, Kc, for the reaction at this temperature?

Express your answer numerically.

Explanation / Answer

PART A ) for the reaction

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

and the equilibrium constant is given as

Kp = Pcocl2 / Pco x Pcl2

= 0.27 / ( 0.9 x 1.12 )

Kp = 0.27

PART B ) for the reaction

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

[HI] = 0.02 M

[H2] = 3.30 - 0.01 = 3.29 M

[I2] = 3.00 - 0.01 = 2.99 M

and the equilibrium constant is given as

Kc = [HI]^2 / [H2][I2]

= ( 0.02 )^2 / ( 3.29 * 2.99 )

Kc = 4.07 x 10^5

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