decomposition of N2O5 to NO2 and O2 is first order with respect to the reactant N2O5 and first order overall.  The rate constant for the reaction at 70.oC is 6.82x10-3 s-1.  The reaction is started with 0.300 mol of N2O5 in a 0.500L container. How many minutes will it take for the concentration of N2O5 to drop to 0.145M?

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