Phosphorus pentachloride, PCl5(g), undergo decomposition as shown:

PCl5 (g) ⇔ PCl3(g) + Cl2(g)

The equilibrium expression for the reaction is

3 answers

The equilibrium expression for the reaction is:

Kc = [PCl3(g)][Cl2(g)] / [PCl5(g)]
are you sure?
My apologies for the confusion.
The correct equilibrium expression for the decomposition of phosphorus pentachloride is:

Kc = [PCl3(g)][Cl2(g)] / [PCl5(g)]