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Computer programs were developed which calculate the reaction rate and second limit of H2 + O2 + N2 mixtures for a given set of velocity constant ratios. By coupling these to an optimization programme, a limited number of ratios can be adjusted to give minimum deviation between observed and calculated rates or limits. A more elaborate programme for reaction rate allows for consumption of reactants and permits the maximum reaction rate to be calculated. The use of these programmes both to establish a detailed mechanism and to obtain some velocity constant ratios over the temperature range 470-530C is described. The best available values for the Arrhenius parameters of the reactions involved are summarized. (Author)