Concentration time data were collected for the following
reaction at 30 oC
A + B --> 2C
Concentration time data at T = 30oC
Time (s) [A] (mol L-1)
0 0.65
15 0.52
30 0.35
45 0.28
60 0.22
75 0.14
90 0.095
(i) Calculate the average rate of consumption of A in the first 15
seconds of reaction.
(ii) Calculate the average rate of production of C in the first 15
seconds of reaction.
(iii) Calculate the average rate of consumption of A in the last 15
seconds of the reaction.
(iv) Explain the difference between the rates of consumption
calculated in (i) and that in (iii)
Rate law can be written as follows.
Rate = -d[A]/dt = 1/2 d[C]/dt
Where -d[A]/dt is the rate of consumption of A.
And d[C]/dt is the rate of production of C.
(i) In the first 15 seconds of reaction, -d[A]/dt = (0.65-0.52) M/(15-0) s = 8.67*10-3 M/s
(ii) In the first 15 seconds of reaction, d[C]/dt = 2 * (8.67*10-3 M/s) = 1.73*10-2 M/s
(iii) In the last 15 seconds of reaction, -d[A]/dt = (0.14-0.095) M/(90-75) s = 3*10-3 M/s
(iv) The rate of sonsumption of A in the initial stage (first 15 seconds) is faster than that in the final stage (last 15 seconds).
i.e. 8.67*10-3 M/s > 3*10-3 M/s
Concentration time data were collected for the following reaction at 30 oC A + B -->...
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