 Solution

ID: past-exam-of-the-chemistry-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2025/5/f/solution

Adding the initiation step to the net forward trapping step cancels the nitrate-radical reaction intermediate:

2N O_{2} + O_{3} ⟶ N_{2} O_{5} + O_{2} .

The net stoichiometry agrees with

- d [N O_{2}] / d t ≃ 2 d [N_{2} O_{5}] / d t

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