Calculate the rate constant, k, for this reaction. (2 marks)

Question

The rate equation for the reaction, P + Q à 2R + S, is found to be:

Rate = k [P]²[Q] 

where [P] = 0.0120 M and [Q] = 0.0350 M, the rate of reaction was 0.450 ´ 10^-4 M/s. 

Answer the following questions. Show your working and state the units clearly.

Answer 1

0.450x10^-4 M/s = k[0.0120 M]²[0.0350 M] = 5x10^-6 M³ *k

k = 4.50x10^-5 M/s / 5x10^-6 M³

k = 9 M^-2s^-1