The equilibrium constant kc for the decomposition of phosgene, cocl2, is 4.63 10-3 at 527°c. cocl2 (g) equilibrium reaction arrow co (g) + cl2 (g) calculate the equilibrium partial pressure of all the components, starting with pure phosgene at 0.760 atm.

By using Kp formula:

Kp = Kc RTΔn

when Kc = 4.63x10^-3

R = 0.0821

T = 527 + 273 = 800 K

Δn = moles of products - moles of reactants = 2-1 = 1

by substitution:

Kp = 4.63x10^-3 * 0.0821 * 800 = 0.304

from ICE table:

COCl2 (g) → CO (g) + Cl2 (g)

initial 0.760 0 0

change - X + X + X

final (0.760-X) + X + X

by substitution:

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

4.63x10^-3 = X*X / (0.76 - X)

∴X = 0.057

∴P (CO) = 0.057

P (Cl2) = 0.057 atm

and P (COCl2) = 0.760-0.057 = 0.703 atm