## Table 15.2 in Textbook

$aR \to bP, Rate = -\frac{1}{a} \frac{d[R]}{dt} = \frac{1}{b}\frac{d[P]}{dt}$

allyz1F
Posts: 58
Joined: Sat Jul 22, 2017 3:00 am

### Table 15.2 in Textbook

Why does table 15.2 in the textbook, which is a list of all the components/equations of 0, 1st, and 2nd order reactions, say that the 1/2-life equations for 0 and 2nd order reactions are not used? Is there a general rule that they do not happen in nature or something?

Evelyn L 1H
Posts: 67
Joined: Fri Sep 29, 2017 7:05 am

### Re: Table 15.2 in Textbook

I had this same question, I think it means the initial concentration is used. As in [A]0 aka A not (but i'm not sure that's how you spell "not") because for the first order reaction, half-lives do not depend on concentration while zero and second order half life equations do.