## Chapter 15 question 19

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

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Anika_Desar_3N
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### Chapter 15 question 19

15.19 The following data were obtained for the reaction A B C S products:
Experiment
Initial concentration (mmol L 1)
[A]0 [B]0 [C]0
Initial rate ((mmol A) L 1 s 1)
8.7 17.4 50.8
457 ?
1 1.25 1.25 1.25
2 2.5 1.25 1.25
3 1.25 3.02 1.25
4 1.25 3.02 3.75
5 3.01 1.00 1.15
(a) Write the rate law for the reaction. (b) What is the order of the reaction? (c) Determine the value of the rate constant.
(d) Use the data to predict the reaction rate for Experiment 5.

I was wondering if someone could explain to me why in the solutions manual it says that "the reaction is second in order in B."

Chem_Mod
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### Re: Chapter 15 question 19

Look at the comparison between experiment 1 and 3. Compare this increase with the increase you see in the reaction rate. This ratio should reflect a second order reaction.

Eugenia Kwon 3O
Posts: 18
Joined: Wed Sep 21, 2016 2:59 pm

### Re: Chapter 15 question 19

You can also look at experiments 2 and 3 to calculate the order for B.
If you calculate for the coefficient m below, it should equal to 2.
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