At a certain temperature in a 5L vessel, 2 moles of carbon monoxide and 3 moles of chlorine were allowed to reach equilibrium according to the reaction, CO + Cl ₂ COCl ₂ . At equilibrium, if one mole of CO is present then equilibrium constant (K_ c ) for the reaction is:

Step-by-step solution

Initially 2 moles of CO are present. At equilibrium, 1 mole of CO is present Hence, 2-1=1 moles of CO has reacted. 1 mole of CO will react with 1 mole of Cl ₂ to form 1 mole of COCl ₂ . 3-1=2 moles of Cl ₂ remains at equilibrium The equilibrium constant K_ c = [ COCl ₂ ] [ CO ] [ Cl ₂ ] = 1 ~mol 5 ~L 1 ~mol 5 ~L 2 ~mol 5 ~L =2.5