The following data have been obtained for the decomposition of N₂O₅(g) at 67°C according to the reaction 2 N₂O₅(g) → 4 NO₂(g) + O₂(g). Determine the order of the reaction, the rate constant, and the half-life. It is not necessary to obtain the result graphically, you may do a calculation using estimates of the rates of change of concentration.

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t/min [N₂O5]/(mol dm-³) 0 1.000 1 0.705 2 0.497 3 0.349 4 0.246 5 0.173