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Overall order from a mechanism with a fast pre-equilibrium and a slow step

This type of question, asked 2 times: 12 Apr 2023, 29 Jan 2025. All 2 questions below, oldest first.

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  1. Question 1

    12 Apr 2023

    59
    The reaction 2NO+Br2→2NOBr2NO +Br_{2}\rightarrow 2NOBr takes places through the mechanism given below: NO+Br2⇌NOBr2NO +Br_{2}\rightleftharpoons NOBr_{2} (fast) NOBr2+NO→2NOBrNOBr_{2}+ NO \rightarrow 2NOBr (slow) The overall order of the reaction is__

  2. Question 2

    29 Jan 2025

    39
    The reaction A2+B2→2ABA_{2}+B_{2}\rightarrow 2AB follows the mechanism
    A2⇌k1k−1 A+A( fast )A+B2→K2AB+B (slow) A+B→AB (fast) \begin{matrix} & A_{2}\underset{k_{- 1}}{\overset{k_{1}}{\rightleftharpoons}}\text{ }A + A(\text{~fast~}) \\ & A +B_{2}\overset{K_{2}}{\rightarrow}AB + B\text{~(slow)~} \\ & A + B \rightarrow AB\text{~(fast)~} \end{matrix}
    The overall order of the reaction is :

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