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The proposed mechanism for the formation of hydrogen bromide can be written in a simplified form as:
Br2(g) ⇌ 2 Br(g) Fast, k1 (forward), k–1 (reverse)
Br(g) + H2(g) → HBr(g) + H(g) Slow, k2
H(g) + Br2(g) → HBr(g) + Br(g) Slow, k3
What rate law corresponds to this mechanism?