Chemistry - Chemical Equilibrium Question with Solution | TestHub

$\begin{array}{cccccc}& {\text{PCl}}_5\left(\text{g}\right)& \rightleftharpoons & {\text{PCl}}_3\left(\text{g}\right)& +& {\text{Cl}}_2\left(\text{g}\right)\\ \text{t}=0& \text{a}& & 0& & 0\\ {\text{t}}_{\text{eq}}& \text{0.6a}& & \text{0.4a}& & \text{0.4a}\end{array}$



$n_{\mathrm{Total}}=1.4a$

$\begin{array}{l}\therefore M_{av}=\frac{208a}{1.4a}\\ \\ =148.57\\ \\ \therefore P_{mix}=\frac{P_{M_{av}}}{RT}\\ \\ =\frac{1\times 148.57}{0.0821\times 420}=4.30\end{array}$