Predict the overall reaction from the following two-step mechanism: a2+2ab→→a2a2b(slow)(fast)

The two-step mechanism is:

    slow

    fast

The overall reaction is the sum of the two reactions:



Now you can cancel the the terms that appear in both sideds:



The fact that one reaction and the other is fast does not change the product. It does change the spped (rate) of reaction, but that is a different point. 

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