00:01
If our chemical reaction is c, l2, plus 3 moles of f2, going to 2 moles of clf3, then the rate of the reaction is going to be equal to negative 1 over 1.
00:23
It'll be 1 over the coefficient of a reactant, negative because it's a reactant, and its change in concentration is decreasing.
00:32
And we can't have a negative rate.
00:37
So with this value being negative, we need a negative sign here to get a positive rate.
00:42
But we could also express that in terms of the change in concentration of fluorine.
00:48
It'll be negative 1 over its coefficient, multiplied by its change in concentration over change in time.
00:59
And then for products, it's positive 1 over their coefficient, multiplied by the change in concentration over change in time.
01:13
So what they have given us is the change in concentration of cl2 over change in time.
01:21
They tell us that this value right here is negative 0 .092 molar per second...