Consider the general gas-phase reaction of a molecular substance, A1. A → BAt very low pressures many such reactions occur by the following mechanism:2. A + A → A* + A (slow)3. A* → B (fast)(A* represents a molecule with sufficient energy to overcome the activation energy barrier.)a) Which of the three reactions above is/are elementary?b) Where appropriate, identify the molecularity of the reactions.c) Show that the proposed mechanism is consistent with reaction 1, the observed reaction.d) Given the mechanism above, suggest a likely rate law for reaction (1).

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Q: half-life

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A: we can calculate the rate law as the following way

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