CAIE A Level Chemistry 9701 · Reaction kinetics

Reaction kinetics: suggest question

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A reaction is thought to proceed by the following two-step mechanism.

Step 1: NOX2(g)+FX2(g)→NOX2F(g)+F(g)\ce{NO2(g) + F2(g) -> NO2F(g) + F(g)} (slow) Step 2: NOX2(g)+F(g)→NOX2F(g)\ce{NO2(g) + F(g) -> NO2F(g)} (fast)

The overall reaction is 2 NOX2(g)+FX2(g)→2 NOX2F(g)\ce{2NO2(g) + F2(g) -> 2NO2F(g)}.

Suggest the rate equation for this reaction and explain your reasoning.

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