The initial concentrations of four species in an equilibrium are [Cl2] = 1.40 M, [HCl] = 0.100 M, [O2] = 0.300 M and [H2O] = 0.500 M. Is the reaction at equilbrium? If not in what direction must the reaaction shift for the equilibrium to be reached? Set up Kc in terms of initial amounts and x as done in class. Do not try to solve for x. Set it up so x is positive.

4 HCl (g) + O2 (g) ---> 2 Cl2 (g) + 2 H2O

At equil? _______

Direction? _____________

Expression? ___________________