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29 June, 16:31

Consider the following representation of a reaction mechanism.

Step 1: Unimolecular (fast)

Step 2: Bimolecular (slow)

Step 3: Unimolecular (fast)

Which conclusion about the rate law for the reaction above is reasonable?

A. It is first order overall because step 1 is unimolecular.

B. It is first order overall because both steps 1 and 3 are unimolecular.

C. It is second order overall because step 2 is bimolecular.

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  1. 29 June, 18:07
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    The rate determining step would be the slow step. Thus, Step 2 which is bimolecular is the rate determining step. I believe the correct answer from the choices listed above is option C. The reasonable conclusion would be that it is second order overall because step 2 is bimolecular. Hope this answers the question.
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