Never mind, I got it now. I'm even more lost though on this.
Write an expression for Kp in the following:
2NO2 -> N2O4
Write an expression for the ionic product of water Kw
Write an expression for Kc for the dissociation reaction of butanoic acid
H(C4H7O2) <-> C4H7O2- + H+
I don't get the Kp, Kc, and Kw. The book doesn't explain this, even though it says on the cover that it makes chemistry easy to learn with full explanations...