Chapter 12, Problem 28QAP

For the system

${\text{PCl}}_5\left(g\right)\rightleftharpoons {\text{PCl}}_3\left(g\right)+{\text{Cl}}_2\left(g\right)$K is 26 at 300°C. In a 1.0-L flask at 300°C, a gaseous mixture consists of all three gases with the following partial pressures: $P_{{\text{PCl}}_5}=0.026\text{atm},P_{{\text{PCl}}_3}=0.65atm{P}_{{\text{PCl}}_2}=0.33atm$

(a) Is the system at equilibrium? Explain.

(b) If the system is not at equilibrium, in which direction will the system move to reach equilibrium?