##### Chemistry Kinetics Problem!

label Chemistry
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Data for the decomposition of hydrogen peroxide at some set temperature T is provided below.  The rate law depends only on the concentration of H2O2.

2 H2O2   --->   2 H2O  + O2

 t (seconds) 0 60 120 180 240 360 420 600 [H2O2] (M) 0.882 0.697 0.566 0.458 0.372 0.236 0.188 0.094

1) What is the value of the rate constant, k?

2) What is the half life of the reaction when the initial concentration of H2O2  is 0.882 M?

3) What is the average rate of reaction, R,  from t = 60 to t = 120?

Sep 27th, 2015

The given reaction is first order reaction because in equal time interval equal proportion of rectant reacted.

1. So we have K= ln({Ao]/[A])/t=putting [Ao]=0.822 and

[A]=.697 and t=20 we get k=3.923*10^-3 or

alternatively = k[H2O2] 0.882-0.697/60 = k *0.882 k = 0.00349 s^-1

2. Half life, t/2= ln2/K=176.8 s

3. Average rate= change in concentration /time taken=0.697-0.566/60 = 2.18333m0l/s.

Sep 27th, 2015

For number 1 choices are only: (a) 3.7x10^-3 /s, (b) 0.12 /s, (c)270 /s, (d) -3.7x10^-3, (e) 0.12 M/s

Sep 27th, 2015

For number 2 my choices are only: (a) 120 s, (b) 5.8 s, (c) 0.0053 s, (d) 155 s, (e) 190 s

Sep 27th, 2015

For number 3 my choices are only: (a) 0.13 M, (b) 0.065 M/s, (c)0.0011 M/s, (d) 910 M/s, (e) 0.0022 M/s

Sep 27th, 2015

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Sep 27th, 2015
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Sep 27th, 2015
Sep 26th, 2017
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