Gradebook pts Score Not Set 403/100 2/21/2018 02:35 PM Question 30 of 36 General

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Gradebook pts Score Not Set 403/100 2/21/2018 02:35 PM Question 30 of 36 General Chemistry stEatnUniversity Science Books pesented by Sapling Leaming The decomposition of niramide, ONNH2·in water has the folowing chemical equation and rate law o,NNH.aq) NMg)-H,Old rate-k A proposed mechanism for this reaction is (1) o,NNHdag) o,NN Hlag).tag) (fast equilibrium ONNIr(aq} Nroje).OH (av) (slow) (fast What is the relationship between the observed value of k and the rate constants for the individual steps Drag the symools into the numerator or denominator k-1 ooutus carers privacy poity ses of use contactua neip MacBook Air 888 , 2 3 5 WER

Explanation / Answer

rate depends on the slowest step
Here 2nd step is slowest
So, rate law is:
rate = k2[O2NNH-]

We need to remove intermediate which is NO3.
we will use 1st step:
Kc = [O2NNH-][H+]/[O2NNH2]
[O2NNH-] = Kc[O2NNH2] / [H+]
Kc is k1/k-1
[O2NNH-] = (k1/k-1) [O2NNH2] / [H+]

put this in rate law:
rate = k2[O2NNH-]
rate = k2(k1/k-1) [O2NNH2] / [H+]
put k = k2(k1/k-1)

rate law is:
rate = k [O2NNH2] / [H+]

Answer:
k = k2 k1 / k-1

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