Chemical Equilibrium

PCl5 dissociates as
PCl5(g)⇌PCl3(g)+Cl2(g)
5 moles of PCl5 are placed in a 200 litre vessel which contains 2 moles of N2 and is maintained at 600 K. The equilibrium prẽššưre is 2.46‌atm. The equilibrium constant Kp for the dissociation of PCl5 is ____×10−3. (nearest integer)
(Given : R=0.082Latm−1mol−1; Assume ideal gas behaviour)