Given the equilibrium system PCL5(g) <----->PCl3(g) + Cl2(g)

Question

K = 12.5 at 60 degrees celsius. A 1.0 L reaction vessel is analyzed and found to contain 3.2 mol Cl2(g), 1.5 mol PCl3(g) and 2.0 mol PCl5(g). Show that the reaction mixture has not yet reached equilibrium.

Answer 1

Set up the expression for Keq.
Then calculate the reaction quotient and compare with Keq. Post your work if you get stuck.