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(g)+Cl2(g)⇌COCl2(g)

Carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 468 ∘C . At equilibrium, the concentrations were measured and the following results obtained:

Gas	Partial Pressure (atm)
CO	0.760
Cl2	1.25
COCl2	0.170

What is the equilibrium constant, Kp, of this reaction

the following reaction was performed in a sealed vessel at 752 ∘C :

H2(g)+I2(g)⇌2HI(g)

Initially, only H2 and I2 were present at concentrations of [H2]=3.15M and  [I2]=2.00M. The equilibrium concentration of I2 is 0.0300 M . What is the equilibrium constant, Kc, for the reaction at this temperature?

Answer 1

1)
Kp = p(COCl2) / {p(CO)*p(Cl2)}
= 0.170 / (0.760*1.25)
=0.179

Answer: 0.179

2)
H2(g) + I2(g) <------> 2HI(g)
3.15         2.00                        0   (initial)
3.15-x     2.00-x                  2x (at equilibrium)

given,
2.00-x = 0.0300
x = 1.97 M

Kc = [HI]^2 / [H2] [I2]
= (2x)^2 / (3.15-x)(2.00-x)
=(2*1.97)^2 / (3.15 - 1.97)*(0.0300)
= 439

Answer: 439