HBr is oxidized in the following reaction:

(a) Show that this mechanism can account for the correct stoichiometry.
(b) Identify all intermediates in this mechanism.
(c) What is the molecularity of each elementary step?
(d) Write the rate expression for each elementary step.
(e) Identify the rate-determining step.

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4 HBr(g) + O₂(g) → 2 H₂O(g) + 2 Br₂(g) A proposed mechanism is HBr + O₂ → HOOBr HOOBr + HBr → 2 HOBr HOBr + HBr → H₂O + Br₂ (slow) (fast) (fast)