Chemistry 102: Equilibrium: Find value of Kp

Question

Phosgene (COCl₂) is used in the manufacture of foam rubber and bulletproof glass. It is formed from carbon monoxide and chlorine in the following reaction:

Cl2​(g)+CO(g)COCl2​(g)

The value of K_c for the reaction is 10.9 at 430.2 °C. What is the value of K_p at 430.2 °C?

Answer 1

Cl₂(g) + CO(g) <==> COCl₂(g) ... balanced equation

Kp = [Kc(RT)]^∆n

Kp = ?

Kc = 10.9

R = 0.0821 Latm/Kmol

T = temperature in Kelvin = 430.2ºC + 273 = 703.2K

∆n = change in number of moles = 1 - 2 = -1

Kp = 10.9 (0.0821*703.2)^-1

Kp = (10.9 *57.73)^-1

Kp = 0.00159