The gas-phase decomposition of N205 has the overall reaction stoichiometry 2 N205→4 NO2 + O2. The first two steps in the mechanism are 2 N205 → 2 NO2 + 2 NO3 NO2 + NO3 → NO2 + NO + O2 What is the third and final step in the mechanism? Do not include physical states in your answer.

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