Consider the reaction below:

$PCl_5(g) \longleftrightarrow PCl_3(g)+Cl_2(g)$



At 500 K, the reaction is at equilibrium with the following concentrations:

$\begin{array}{l}

{\left[PCl_5\right]=0.0095 M} \\

{\left[PCl_3\right]=0.020 M} \\

{\left[Cl_2\right]=0.020 M}

\end{array}$



What is the equilibrium constant for the given reaction?

A0.042

B2.4

C24

D0.42