## 15.35

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

Abigail Volk 1F
Posts: 52
Joined: Fri Sep 29, 2017 7:07 am
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### 15.35

In part a) you plug in 1/ .84/16 for [A] which flips and is basically 16/.84 but in part b) you get 1/ .84/4 for [A] and you don’t flip this one and get 1/.21. Why do you flip part a but not part b fraction wise?

SantanaRodriguezDis1G
Posts: 56
Joined: Sat Jul 22, 2017 3:00 am

### Re: 15.35

in Part A you are using the half life equation where in part b and c you use the formula: (1/[a]) = (1/[a]0) +kt and solve for t