## 7A.13

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

Maggie Doan 1I
Posts: 61
Joined: Fri Sep 28, 2018 12:24 am

### 7A.13

In the reaction CH3Br + OH- $\rightarrow$ CH3OH + Br-, when the OH- concentration alone was doubled, the rate doubled; when the CH3Br concentration alone was increased by a factor of 1.2, the rate increased by a factor of 1.2. Write the rate law for the reaction.

How do you determine the rate law?

Iris Bai 2K
Posts: 60
Joined: Fri Sep 28, 2018 12:18 am

### Re: 7A.13

Since you can see that an increase concentrations of both species also increase the rate by the same factor, you can tell that this reaction is first order for both reactants.

Gracie Ge 2E
Posts: 28
Joined: Wed Nov 21, 2018 12:19 am

### Re: 7A.13

as the concentration of A increases by x, the rate of the reaction increases by x^a.
a=the reaction order of A.

Marsenne Cabral 1A
Posts: 59
Joined: Fri Sep 28, 2018 12:19 am

### Re: 7A.13

I think a way to do this is put in hypothetical concentrations for each number and see what exponent makes the rate double for each situation.