Question

Consider the following three-step representation of a reaction mechanism and rate laws


Step 1: A + B ---> AB (fast) and the rate = k[A][B]
Step 2: AB + B ---> AB2 (slow) and the rate = k[AB][B]
Step 3: AB2 + B ---> AB3 (fast) and the rate = k[AB2][B]
Overall: A + 3B ---> AB3 and the rate = k[A][B]2

Which is the rate-limiting step for the reaction mechanism above?

A.overall: A + 3B --> AB3 and the rate = k[A][B]2

B.step 1: A + B --> AB (fast) and the rate = k[A][B]

C.step 2: AB + B -->AB2 (slow) and the rate = k[AB][B]

D.step 3: AB2 + B --> AB3 (fast) and the

Answer 1

the slowest step is rate determining step :P

Answer 2

So it would be C?

Answer 3

bingooooo:)

Answer 4

Thanks :)