1. Given the reaction 2A + 3B à C + 4D the reaction is zeroth order with respect
ID: 501361 • Letter: 1
Question
1. Given the reaction 2A + 3B à C + 4D the reaction is zeroth order with respect to A and second order with respect to B. If the concentration of both A and B are doubled and the temperature remains unchanged, the rate of the reaction will increase by a factor of what? Why?
2. The kinetics of the reaction A+B à P were studied. The following data was collected. What is the rate law for this reaction? Why?
Expt
[A] (M)
[B] (M)
Initial rate (M/s)
1
0.273
0.763
2.83
2
0.273
1.526
2.83
3
0.819
0.763
25.47
Expt
[A] (M)
[B] (M)
Initial rate (M/s)
1
0.273
0.763
2.83
2
0.273
1.526
2.83
3
0.819
0.763
25.47
Explanation / Answer
1) with respect to A reaction is zero order.
with respect to B second order.
so by doule the concentration of A rate will not change.
by double the concentration of B rate increased by 4 times.
2) with respect to A reaction is second order
with respect to B reaction is zero order
rate = K [A]2
reaction is zero order with respect to B. so it is excluded in rate law.
when concentration of A increases 3 times reaction increases 9 times so second order with respect to A
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