Research in your lab is focusing on the reaction: 2A + 2B C + D After performing

Question

Research in your lab is focusing on the reaction:
2A + 2B C + D
After performing many different experiments, you have determined that the rate law for this experiment is: rate=k[A][B]. You and your graduate student have come up with six possible mechanisms for the reaction. How many of the following mechanisms are plausible mechanisms based on the rate law information you have?

1
3
2
4
0        

Mechanism 1          Mechanism 2 A + A + B E fast A + A + B C + D slow E + B C + D slow Mechanism 3          Mechanism 4 A + A E slow A + B E slow E + B F fast E + A F fast F + B C + D fast F + B C + D fast Mechanism 5          Mechanism 6 A + A E fast A + B E fast E + B F slow E + A F slow F + B C + D fast F + B C fast

Explanation / Answer

Given rate,r= k[A][B]

So the order of the reaction with respect to A and B are 1

In the given mechanism the slowest step is the rate determining step.

If the slowest rate determining step involves one molecule of A and B then it is the correct mechanism.

Mechanism 4 is correct

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