At 444°C 30% of gaseous  HI dissociated in a closed vessel of 1 litre in order to attain equilibrium. If 4 moles of  HI  was taken initially, the equilibrium constant KC for the reaction 2HI(g)⇌H2(g)+I2(g) is ____?

2HI(g)⇌H2(g)+I2(g) Initial moles    400 At equilibrium   2.81.21.2Equilibrium constant KC=H2I2[HI]2                                                       =(1.2)(1.2)(2.8)2                                                        = 0.183