## 7B.9

$\frac{d[R]}{dt}=-k[R]; \ln [R]=-kt + \ln [R]_{0}; t_{\frac{1}{2}}=\frac{0.693}{k}$

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

### 7B.9

For the first order reaction A $\rightarrow$ 3B + C, When [A]0 = .015 mol/l, the concentration of B increases to .018 mol/ L in 3.0 min.

a) What is the rate of constant for the reaction expressed as the rate of loss of A?

I got the answer 1.7 minutes but the answer is .17 minutes. I was wondering how they got the answer.

Nicklas_Wright_1A
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

### Re: 7B.9

If you use the equation you should get the right answer. I recommend rechecking your math as you probably put a decimal point in the wrong place.

Destiny Diaz 4D
Posts: 51
Joined: Fri Sep 28, 2018 12:28 am

### Re: 7B.9

the mistake is more likely in your unit conversions, I would just double check those.