## Homework #15.29

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

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arif_latif_2G
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

### Homework #15.29

Can someone walk me through this question:
For the first-order reaction A -> 3 B + C, when [A]0 = 0.015 mol x L^-1, the concentration of B increases to 0.018 mol x L^-1 in 3.0 min. (a) What is the rate constant for the reaction expressed as the rate of loss of A? (b) How much more time would be needed for the concentration of B to increase to 0.030 mol x L^-1?

Riya Shah 4H
Posts: 65
Joined: Wed May 02, 2018 3:00 am

### Re: Homework #15.29

(a) Since it is a first-order reaction, the rate constant k=[A]^1 and in terms of loss of A, you can just put a negative sign and say that it is decreasing.

(b) I am not sure about this one but would like to know the answer.

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