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

ID: 480736 • Letter: A

Question

A proposed mechanism for one of the pathways for the destruction of ozone in the atmosphere is:

step 1 slow: O3 + NO -----> NO2 + O2

step 2 fast: NO2 + O ------> NO + O2

(1) What is the equation for the overall reaction? Use the smallest integer coefficients possible. If a box is not needed, leave it blank.

(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 = ________

+ +

answer 1) slow reaction : O3 + NO -------> NO2 + O2

fast reaction : NO2 + O ------> NO + O2

now we add both equation to form overall reaction

sum of the two steps is equal to the overall reaction: O(g) + O3(g) ? 2O2(g)

2. NO catalyst is used in this step .

3. NO2 act as an intermediate

4. The rate for this reaction mechanism is rate = k [O] [O3]

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