Chapter 17, Problem 19QAP

. Suppose that for the reaction
${\text{PCl}}_{\text{5}}\left(g\right)\rightleftharpoons {\text{PCl}}_3\left(g\right)+{\text{Cl}}_{\text{2}}\left(g\right)$   it is determined, at a particular temperature. that the equilibrium concentrations are $\left[{\text{PCl}}_{\text{5}}\left(g\right)\right]=0.0711M,\left[{\text{PCl}}_{\text{3}}\left(\text{g}\right)\right]=0.0302M$, and $\left[{\text{Cl}}_{\text{2}}\left(g\right)\right]=0.0491M$. Calculate the value of K for he reaction at this temperature.