The gas phase decomposition of dinitrogen pentoxide at 335K N205(9)→2 NO2(g) + ½ 02(g) is first order in N205 with a rate constant of 4.70x10-3 s-1. If the initial concentration of N205 is 3.65x10-2 M, the concentration of N205 will be 6.39×10-3 M after | s have passed.

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