## 15.17 type problems

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

Sophie Krylova 2J
Posts: 59
Joined: Fri Sep 29, 2017 7:06 am

### 15.17 type problems

How much work do we need to show for this kind of problem? Because sometimes you can just look at the data and estimate the orders for the reactants.

Dang Lam
Posts: 55
Joined: Thu Jul 27, 2017 3:01 am

### Re: 15.17 type problems

Yes you can look at the data and tell the order of the reactant but Dr.Lavelle requires some sort of work or explanation in order to receive full credit. You can use the ratio of concentration to rate to show work.

Jennie Fox 1D
Posts: 66
Joined: Sat Jul 22, 2017 3:01 am

### Re: 15.17 type problems

For work, I usually show something like 2^a=2 (the concentration doubled, rate doubled), therefore a=1, and the order of [A] is first order. But you need to show work, at least on the quizzes and tests,

Harrison Wang 1H
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: 15.17 type problems

You can show your work by writing the ratio of concentration in exp 1 over concentration in exp 2 raised to some power equals the ratio of rate in exp 1 over rate in exp 2. This would be written as (conc1/conc2)^n=(rate1/rate2) where n is the order.

Jessica Benitez 1K
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

### Re: 15.17 type problems

I show work in these problems by:
1) Specifying which reactant I'm finding the order of
2) Taking the ratio of the initial rates for the two experiments
3) Taking the ratio of the concentrations for the two experiments
4) Solve for n in: (ratio of concentrations)^n=(ratio of initial rates)
5) The value of n is the order for that reactant