A proposed mechanism for one of the pathways for the destruction of ozone in the

Question

A proposed mechanism for one of the pathways for the destruction of ozone in the atmosphere is: step1 slow: O3 +NONO2 + 02 step 2fast NO2 + O NO + 02 t rc (2) Which species acts as a catalyst? Enter formula. If none, leave box blank: (3) Which species acts as a reaction intermediate? Enter formula. If none, leave box blank (4) Complete the rate law for the overall reaction that is consistent with this mechanism. (Use the form k[A]m [B]n , where '1' is understood (so don't write it) for m, n etc.) Rate

Explanation / Answer

1)

overall reaction can be obtained by adding both steps

O3 + O —> 2 O2

2)

Intermediate are 1st produced in reaction and then are used up in next steps

NO2 is intermediate that is produced in 1st step and used in 2nd step

Answer: NO2

3)

catalyst is 1st used up and then reproduced back

NO is catalyst here

Answer: NO

4)

Rate depends on the slowest step

So, rate law will be:

rate = k [O3][NO]

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