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I\'m working on this problem for Chem E reactions class. I can\'t seem to get th

ID: 818380 • Letter: I

Question

I'm working on this problem for Chem E reactions class. I can't seem to get the mechanism right.  I'm assuming that there is an intermediate that happens somewhere since reaction rate for the products is a second order reaction.  Please help.  Please spell out the rate equations so I can compare.


Thanks in advance!


The problem reads:

Come up with (guess and then verify) a mechanism that is consistant with the experimetally found rate equation for the following reaction:


2A + B rightarrow A2B with + rA2B = k[A][B]

Explanation / Answer

golden rule:-

for all rate law questions rate is determined by slowest step!


A+B-------------> AB (SLOW)

A+AB-------------- > A2B (FAST)

2A+B--------------- > A2B (OVERALL)


so here rate is determined by the slowest steo that is A+B-------------> AB ... so the rate equation will be k[A][B]