For the reaction ${\mathrm{I}}_2\left(\mathrm{g}\right)\rightleftharpoons 2\mathrm{I}\left(\mathrm{g}\right),K_c=0.01{\mathrm{molL}}^{-1}$ The volume of the vessel if $1.0 \mathrm{mol}$ of $I_2$ and 0.5 mol of I are present at equilibrium is