The equilibrium composition for the reaction $\mathrm{PCl}_{3}+\mathrm{Cl}_{2} \rightleftharpoons \mathrm{PCl}_{5}$ at $298 \mathrm{~K}$ is given below:

$\left[\mathrm{PCl}_{3}\right]_{\mathrm{eq}}=0.2 \mathrm{~mol} \mathrm{~L}^{-1},\left[\mathrm{Cl}_{2}\right]_{\mathrm{eq}}=0.1 \mathrm{~mol} \mathrm{~L}^{-1},\left[\mathrm{PCl}_{5}\right]_{\mathrm{eq}}=0.40 \mathrm{~mol} \mathrm{~L}^{-1}$

If $0.2 \mathrm{~mol}$ of $\mathrm{Cl}_{2}$ is added at the same temperature, the equilibrium concentrations of $\mathrm{PCl}_{5}$ is __________ $\times 10^{-2} \mathrm{~mol} \mathrm{~L}^{-1}$

Given : $\mathrm{K}_{\mathrm{c}}$ for the reaction at $298 \mathrm{~K}$ is 20