A + B F + G which is catalyzed by reagent C. The rate of this reaction was monit
ID: 922111 • Letter: A
Question
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.
0.000119
0.000316
7.90e-05
5.92e-05
5.92e-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?
Step 2 as the rate determining step. All other steps fast steps.
Step 2 as the rate determining step. Step 1 is a fast equilibrium step while step 3 is a fast step.
Step 3 as the rate determining step. All other steps fast steps.
Step 3 as the rate determining step. Step 2 is a fast equilibrium step while step 1 is a fast step.
(M) [B]
(M) [C]
(M) Rate of disappearance of B
(M/s) 1 0.300 0.0500 0.100
0.000119
2 0.400 0.0500 0.2000.000316
3 0.400 0.0500 0.05007.90e-05
4 0.300 0.0500 0.05005.92e-05
5 0.300 0.100 0.05005.92e-05
Explanation / Answer
The most important points from the kinetics
1) Concentration of B has no role in the totoal kinetics compare expeiments 4 and 5 so step 3 cannot be rate limiting.
2) Concentration of both A and C are important as changing these two changes the rate of the reaction.
The rate of the B falling is directly related to the chnages made to either A or C so the step 1 cannot be in equilibrium even if it is fast.
SO the correct answer should be
Step 2 as the rate determining step. All other steps fast steps.
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