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In a study of nitrosyl halides, a chemist proposes the following mechanism for the synthesis of nitrosyl bromide:
NO(g) + Br2(g) ⇌ NOBr2(g) [fast]
NOBr2(g) + NO(g) ⟶ 2NOBr(g) [slow]
If the rate law is rate = k[NO]2[Br2], is the proposed mechanism valid? If so, show that it satisfies the three criteria for validity.