Please Solve, 1. The following mechanism has been proposed for this reaction: H
ID: 876372 • Letter: P
Question
Please Solve,
1. The following mechanism has been proposed for this reaction:
H2O2+ I– IO– + H2O
H2O2 + IO– I– + H2O + O2
If this mechanism is correct, which step must be the rate-determining step? Explain.
2. Another form of the Arrhenius equation is: ln k = -Ea/R(1/T) + ln A. A plot of ln k vs. 1/T will give a straight line whose slope is – Ea/R. Determine the activation energy of a reaction given the following data. Use excel to make a plot of lnk vs 1/T. Turn in the plot you made.
k (s-1)
T (°C)
2.0 x 10-5
20
7.3 x 10-5
30
2.7 x 10-4
40
9.1 x 10-4
50
2.0 x 10-3
60
k (s-1)
T (°C)
2.0 x 10-5
20
7.3 x 10-5
30
2.7 x 10-4
40
9.1 x 10-4
50
2.0 x 10-3
60
Explanation / Answer
1) First step is rate determining step.
You should write out the chemical equation and then the intermediate steps. Anyway, if those are the only intermediate steps then the overall reaction is:
2 H2O2 --> 2 H2O + O2
If the overall rate of the reaction, something you didn't write down in your question, is:
Rate = k1[H2O2][I-]
then the rate is consistent with the reactions you wrote down, where the first step is rate-limiting. If the second step would have been rate-limiting then the rate would have been:
Rate = k2[H2O2][IO-]
where [IO-] can be expressed in terms of the concentrations of the other chemicals, this rate will differ considerably from the one we proposed first.
2) i dont have exell sheet knowledge.
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