2 moles of PCl5 was heated in a closed vessel of 2 litre capacity. At equilibrium, 40% of PCl5 is dissociated into PCl3 and Cl2. The value of equilibrium constant is

PCl5   ⇌   PCl3  +  Cl2Initially :     2                 0          0at euil. : 2 × 60100    2 × 40100  2 × 40100Volume of container = 2 LKC = 2 × 40100 × 2 × 2 × 40100 ×22 × 60100 ×2=0.266