Question

The decomposition of ammonium nitrate in an aqueous solution was studied by placing the apparatus in a thermostat maintained at a particular temperature. The volume of nitrogen gas collected at different intervals of time was as follows:

The above data prove that the reaction is of the first order.

Answer 1

For a first-order reaction,

In the present case, V_∞ = 35.05 cm³. The value of R at each instant of time can be calculated as follows:

Values of ‘k’ come nearly constant and hence the reaction is first order.