Answer
See the answer below.
Work Step by Step
a) The slow step is rate-determining.
b) For the slow step: $r_S=k[O_3][O]$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.