4.5 moles each of hydrogen and iodine heated in a sealed ten litre vessel. At equilibrium, 3 moles of HI were found. The equilibrium constant for H2(g) + I2(g) 2 HI(g) is

CHEMICAL EQUILIBRIUM 38 2 2 H I 2HI Initial Concentration 4.5 mol 4.5 mol 0 Change in concentration 1.5 mol 1.5 mol 3 Equilibrium concentration 3 mol 3 mol 3 2 2 C 2 2 HI 3 K = = = 1 H I 3 3