At a certain temperature the equilibrium constant  K_c is 0.25  for the reaction ${\mathrm{A}}_2\left(\mathrm{g}\right)+{\mathrm{B}}_2\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{C}}_2\left(\mathrm{g}\right)+{\mathrm{D}}_2\left(\mathrm{g}\right)$ If we take 1 mole of each of the four gases in a 10 litre container, what would be equilibrium concentration of ${\mathrm{A}}_2\left(\mathrm{g}\right)?$