At a given temperature, and pressure of ammonia, the rate of reaction could be expressed by the equation, reciprocal of half life = (k3k2/k2 + k,pN2) + k4. This equation was derived theoretically. The observed heat of activation for the decomposition was found to be 53,200 calories, which was shown to be the true heat of activation. k. The writer wishes to express his best thanks to Prof. W. D....