Part A: Phosgene (carbonyl chloride), C O C l 2 , is an extremely toxic gas that

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

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

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

Explanation / Answer

(A) CO + Cl2 <=> COCl2

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

= 0.220/(0.720 x 1.24)

= 0.2464 = 0.246


(B)..H2...+...I2...<=>...2 HI

I...3.85......2.20.............0

C....-a........-a..............+2a

E..3.85-a...2.20-a........2a


At equilibrium:

[I2] = 2.20 - a = 0.0300 M

=> a = 2.17


[H2] = 3.85 - a = 1.68 M

[HI] = 2a = 4.34 M


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

= 4.34^2/(1.68 x 0.0300)

= 374

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