1.72 moles of NOCI were placed in a 2.50 L reaction chamber at 427°C. After equilibrium was reached, 1.16 moles of NOCI
remained. Calculate the equilibrium constant, K., for the
reaction
2NOCI(g) = 2NO(g) + Cl2(g).

The equilibrium constant, Kc=0.026

Given

1.72 moles of NOCI

1.16 moles of NOCI  remained

2.50 L reaction chamber

Reaction

2NOCI(g) = 2NO(g) + Cl2(g).

Required

the equilibrium constant, Kc

Solution

ICE method

   2NOCI(g) = 2NO(g) + Cl2(g).

I    1.72

C   0.56           0.56         0.28

E   1.16              0.56         0.28

Molarity at equilibrium :

NOCl :

NO :

Cl2 :