Question

What is the rate constant for a reaction based on the following experimental information?

Experiment

Rate (M/s)

[A] (M)

[B] (M)

1

0.7082

0.39

0.39

2

1.216

0.663

0.39

3

0.694

0.39

0.897

Answer 1

first of all lets see how the rate changes when one reactant conc. is kept constant nd other is changed.

in 2, when A is changed to 0.663, increase factor= 0.663/.39 = 1.7

rate increase factor= 1.216/.7082= 1.7

SO we come to know that rate is linearly deendent on [A]

similarly in 3, with respect to [B], rate is decreased with increase in conc. of [B]. But it nearly remains the same. So, it can be assumed to not chnge. So rate is independent of conc. of [B].

therefore rate constant:

0.7082= k *0.39

k= 1.815 s^-1