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Heterogeneous decomposition of ammonia on a tungsten wire at 927°C occurs as follows: 2 NH3 (g)...

Heterogeneous decomposition of ammonia on a tungsten wire at 927°C occurs as follows:

2 NH3 (g) <-> N2 (g) + 3 H2 (g).

The total pressure of the reaction mixture changes with time as follows:

t / s          |   0      100    200    300    400    500    600    800    1000

p / mmHg    | 200    214    227    238    248    259    270    292    312

Determine the reaction order and calculate the reaction rate constant ( k ).

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