The reaction 2 NO2→2 NO + O2 has the rate constant k = 0.63 M- 1s- 1. (a) Based on the units for k, is the reaction first or second order in NO2? (b) If the initial concentration of NO2 is 0.100 M, how would you determine how long it would take for the concentration to decrease to 0.025 M?
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