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

Answer 1

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