An equilibrium mixture, CO(g) + H2O(g) ⇋ CO2 (g) + H2 (g), present in a vessel of one litre capacity at 1000 K was found to contain 0.4 mole of CO, 0.3 mole of H2 O, 0.2 mole of CO2 and 0.6 mole of H2 . If it is desired to increase the concentration of CO to 0.6 mole by adding CO2 into the vessel, how many moles of it must be added into equilibrium mixture at constant temperature in order to get this change?
