in a study of the decomposition of ammonia on a tungsten surface at 1100 °C NH31/2 N2 + 3/2 H2 the concentration of NH3 was followed as a function of time. It was found that a graph of [NH3] versus time in seconds gave a straight line with a slope of -5.24×10-6 M s-1 and a y-intercept of 7.41×10-3 M. Based on this plot, the reaction is  order in NH3 and the rate constant for the reaction is M s-1

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