Practice Problem 5

Determine the molecularity of each step in the reaction by which N2O5 decomposes to NO2 and O2.


All we have to do is count the number of molecules consumed in each step in this reaction to decide that the first step is unimolecular and the other two steps are bimolecular:   

Step 1: N2O5 <----> NO2 + NO3
Step 2: NO2 + NO3 <----> NO2 + NO + O2
Step 3: NO + NO3 <----> 2 NO2

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