18. The reaction of ammonia decomposition on a hot tungsten wire occurs according to the stoichiometric equation 2NH3=N2 3H2. During the reaction, at different moments in time, the pressure increased as follows:
Time, s.. 100 200 400 600 800 1000
Pressure increase, Pa 1466.3 2945.9 5865.2 8837.8 11717.0 14663.0
Express these results graphically and determine the order of the reaction from the graph. If the initial pressure was 200 mm Hg, calculate the rate constant (express the concentrations through the pressure in Pa) and indicate the unit of the rate constant.

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