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Dear JohnRC, Thanks for your reply. I appreciate it. You were right: in my previous post, I meant NH_3 instead of NH_2. (1) So, the reaction should be rather: 3 N_2H_4 \rightarrow 4 NH_3 + N_2 1.2 NH_3 \rightarrow 0.6 N_2 + 1.8 H_2 (30% of 4 NH_3 decomposes). Since the...

Dear all, Homework Statement For practice, I'm trying to solve an exercise I've found on the Internet. A screen shot of it is attached. I would like to be sure about my approach, especially when it comes to question 2. Let's say, for the sake of simplification, that the reaction is as...

Dear D H, Thanks for your reply. It's now clear to me that this change of variable is for positive values only. Regards.

Indeed, my bad, thanks to both of you.

Dear All, I computed an integral that looks like erf(x) without problem: \int_{-\infty}^{+\infty} e^{-t^2} dt = \int_{-\infty}^{0} e^{-t^2} dt + \int_{0}^{+\infty} e^{-t^2} dt = \frac{\sqrt{\pi}}{2} [-erf(-\infty)+erf(+\infty)] = \frac{\sqrt{\pi}}{2} [-(-1)+1] = \sqrt{\pi}. However, what...