Rate Equation from Initial Pressures and Half Lives

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Problem:
The thermal decomposition of nitrous oxide (N2O) in the gas phase at 1030 K is studied in a constant volume vessel at various initial pressures of N2O. The half-life data so obtained are as follows:

po (mm Hg) 52.5 139 290 360

t1/2 (sec)                 860 470 255 212

2N2O ----> 2N2 + O2
Determine the rate equation that fits the data