00:01
To determine the rate law, we need to look at the experiments and see what is changing.
00:06
In experiments 1 and 2, we see that the concentration of a is constant, but the concentration of b is tripled.
00:17
So only the concentration of b is tripled.
00:24
When it's tripled, we see that the rate increases.
00:31
It goes to 2 .55 from 0 .8.
00:36
850.
00:38
So 2 .55 divided by 8, sorry, 2 .55 divided by 0 .850 gives us 3.
00:50
So when we triple the concentration, we triple the rate.
00:54
This is representative of first order.
00:58
So that means it's first order with respect to b.
01:04
Now, if we look at experiments, yeah, this is where it gets challenging.
01:18
So if we look at experiments 3 and 2, we see that the concentration of a goes from 1 .25 to 3 .75, so it's tripled.
01:52
Then we look at b.
01:58
B goes from 0 .2 to 0 .3, so it increases 1 .5...