The gas phase decomposition of dinitrogen pentoxide at 335 K N₂O5 (g) → 2 NO2(g) + ½ O₂(g) is first order in N₂O5. In one experiment, when the initial concentration of N₂O5 was 0.129 M, the concentration of N₂O5 dropped to 2.36 × 10-2 M after 235 seconds had passed. Based on these data, the rate constant for the reaction is 8-1

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