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H ydrazoic acid vapor at low pressures (0.15 mm Hg or less) , has been decomposed thermally and the rate of reaction studied mass spectrometrically at 2650 to 3250 C. Nitrogen and ammonia are the only reaction products, and no intermediates were observed. The disappearance of HNa is first order and the reaction occurs on t he walls of the glass reaction vessel. The experimental activation energy is 31 kilocalories per mole. The activation energy for the reaction HN3~NH+ J2 must be at least 39 kilocalories per mole.

Mass spectrometric study of the rate of thermal decomposition of hydrazoic acid