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A reaction is first order in A and second order in B. (i) Write the differential rate equation. (ii) How is the rate affected on increasing the concentration of B three times? (iii) How is the rate affected when the concentrations of both A and B are doubled?

A reaction is first order in A and second order in B. (i) Write the differential rate equation. (ii) How is the rate affected on increasing the concentration of B three times? (iii) How is the rate affected when the concentrations of both A and B are doubled?

Grade:8

1 Answers

Gaurav
askIITians Faculty 164 Points
9 years ago
(i)
d[A]/dt = -k[A]
and
d[B]/dt = -k[B]2

(ii)
Reaction is second order to B so increasing the concentration of B three times will increase the rate of reaction 9 times.

(iii)
Doubling the concentration of both A & B will increase the rate of reaction 8 times.
Mathematically
R’ = [2A][2B]2 = 8[A][B]2

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