2001 free response Question [urgent] Hello Physics forum- Over the past couple of hours ive been trying to solve an AP Chem problem. I'm self studying for the AP exam and i got a copy of a bunch of past free response questions to help me study. Most are hard, and without a class, its even harder to understand. So now, after a lot of trial and error, I decided to ask this forum. Please help in any way, shape or form. I'm still not 100% sure how to even approach this problem, and I'd appreciate ANY input. I scanned the problem to make it easier for all of us: http://img168.imageshack.us/img168/1974/57575757557copysi8.jpg Thank you.