00:01
So here's a rough sketch of the concentrations versus times.
00:04
For a more precise one, you can look at the textbook.
00:08
And looking at that more precise one, it's apparent that the ending concentration, like the way that b slopes down, a seems to slope up twice as fast.
00:21
So that means that you have like the ratio is going to be 1b produces 2a or 1b, requires 2a.
00:31
Now it's a matter of does 2a form b or does b form 2a? well, we see that the concentration of b goes down over time, meaning it's used up.
00:40
Concentration of a goes up over time, meaning that it's formed.
00:44
So the one that's used up is the reactant, and then the one that's formed is the product, so it's going to be b makes 2a...