Chapter 7, Problem 71P

Interpretation Introduction

Interpretation:

The equilibrium concentrations of ${\text{Cl}}_{\text{2}}$ should be determined.

Concept Introduction:

The given equilibrium reaction representing the formation of ${\text{PCl}}_{\text{3}}$ and ${\text{Cl}}_{\text{2}}$ from ${\text{PCl}}_{\text{5}}$ is,

${\text{PCl}}_5(g)◰\hspace{1em}{\text{PCl}}_3(g)+{\text{Cl}}_2(g)$

Equilibrium constant, K for this reaction can be determined using the equilibrium molar concentrations of PCl₅, PCl₃ and Cl₂ as below,

$\text{K=}\frac{{\text{[PCl}}_{\text{3}}{\text{][Cl}}_{\text{2}}\text{]}}{{\text{[PCl}}_{\text{5}}\text{]}}$.