At a certain temperature, the equilibrium constant $k_c$ is 0.25 for the reaction $A_{2\left(g\right)}+B_{2\left(g\right)}\rightleftarrows C_{2\left(g\right)}+D_{2\left(g\right).}$ If we take 1 mole of each of the four gases in a 10 litre container, what would be equilibrium concentration  of  $A_{2\left(g\right)}$