Chemical Kinetics

The kinetics of the catalytic decomposition of NH3 into N2 and H2 on a hot tungsten filament at 1100 °C was investigated by Kunsman. He measured the times (t1/2) required for half of NH3 to decompose at different initial NH3 pressures, as shown below:

P (torr) t1/2 (minutes)
265 7.6
130 3.7
58 1.7
Determine (i) the order of the reaction and (ii) the rate constant.

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  1. a). NH3== N2 + H2
    BAlance:

    2NH3 == N2 + 3H2
    -r= kC(NH3)2

    >> Therefore th order of rxn is 2nd order

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