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Can anyone give me a link to a site with lots of organic chemistry practice problems, specifically those that involve reaction mechanisms. Also I need the answers that go with them so I can check if I'm doing stuff right.

N2O4(g) = 2NO2(g) The equilibrium constant Kc at 25C is 0.125. What percentage of dinitrogen tetroxide is dissociated when 0.0330 mol N2O4 is placed in a 1.00-L flask at 25C? alright so here's what i'm doing [NO2] = n [N2O4] = m n + m = .033 m = .033 - n .125 = (n^2)/(.033-n) n = .0271172...