The rate constant for the reverse reaction of the rate controlling step (NO+O2+NO2=NO2+NO3) of high pressure nitrogen pentoxide decomposition has been determined to be 6.58×107 cc2 mole—2 sec—1. This reaction was found to be the rate‐controlling step in the nitrogen dixoide catalyzed oxidation of nitrosyl chloride to nitryl chloride. The equilibrium constant at 25° for the reaction ClNO+NO2=ClNO2+NO as evaluated from the kinetic data was found to be 1×10—4.

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