Phosphorous Trichloride and Phosphorous Pentachloride Equilibrate in the Presence of Molecular

question 91

Multiple Choice

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
PPCl₃ = 0.124 atm,
PCl₂ = 0.157 atm, and
PPCl₅ = 1.30 atm. What is the value of K_p at this temperature?

• A)66.7
• B)1.50 × 10^-2
• C)2.53 × 10^-2
• D)1.02
• E)4.63