Question

determine the order of the reaction, [A] and [B]

[A] M	[B] M	Initial rate M/s
0.100	0.050	0.0288
0.100	0.100	0.0411
0.200	0.200	0.116

Answer 1

The rate order can be determined using the rate law expression:

where x and y are the rate orders on reactant A and B respectively.

To get the rate order y on B, you need to choose two sets of data where the concentration of A on those sets are equal. We would start on determining order on B, since there are no two sets of data with the same concentration for B.

We can see the first and second set of data have 0.100 M of A on them, so we use or that would be

To find x or the order on A on B, we can use any two sets of data since we already know y. We can use sets 3 and 1 or which also means . Subtituting the data from the table, this gives us:

Therefore the rate order on A is 1, the rate order on B is .