‘X’ moles of ${\mathrm{CaCO}}_3$ is taken in a closed vessel. At ${819}^{\mathrm{o}}\mathrm{C}$ and 1 atmosphere, equilibrium is attained for the reaction ${\mathrm{CaCO}}_3\left(\mathrm{s}\right)\stackrel{ }{\rightleftharpoons }\mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)$. Equilibrium concentration of ${\mathrm{CO}}_2 \mathrm{is} \frac{1}{89.6}\mathrm{M} .$ ${\mathrm{K}}_{\mathrm{p}}$for the reaction is (assume ideal behaviour of ${\mathrm{CO}}_2$)