Consider the fictional reaction: A + B F + G which is catalyzed by reagent C. Th

Question

Consider the fictional reaction:
A + B F + G
which is catalyzed by reagent C.
The rate of this reaction was monitored by looking at the disappearance of B under several different experimental setups at 298 K.

5.66e-05

5.66e-05

0.000113

0.000302

7.54e-05

Step 1: A + C D
Step 2: D E + C
Step 3: E + B F + G

Given the previous information, which of the following situations would lead to a plausible reaction mechanism?
1) Step 3 as the rate determining step. Step 2 is a fast equilibrium step while step 1 is a fast step.
2) Step 3 as the rate determining step. All other steps fast steps.
3) Step 2 as the rate determining step. All other steps fast steps.
4) Step 2 as the rate determining step. Step 1 is a fast equilibrium step while step 3 is a fast step.
5) Step 1 as the rate determining step. All other steps fast steps.

Experiment [A]
(M) [B]
(M) [C]
(M) Rate of disappearance of B
(M/s) 1 0.300 0.0500 0.0500

5.66e-05

2 0.300 0.100 0.0500

5.66e-05

3 0.300 0.0500 0.100

0.000113

4 0.400 0.0500 0.200

0.000302

5 0.400 0.0500 0.0500

7.54e-05

Explanation / Answer

1) Step 3 as the rate determining step. Step 2 is a fast equilibrium step while step 1 is a fast step.

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