Answer to Question #323345 in General Chemistry for Wellen

Question

Phosphorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to the reaction: PCl3(g) + Cl2(g) → PCl5(g). An equilibrium mixture at 450 K contains the following:

PPCl3 = 0.202 atm

PCl2 = 0.256 atm

PPCl5 = 3.45 atm

What is the value of Kp at this temperature?

Answer 1

PCl₃(g) + Cl₂(g) → PCl₅(g)

K_p = [PCl₅] / ([Cl₂] × [PCl₃]) = (3.45)/(0.256 × 0.202) = 66.7