The reaction 2NO2⟶2NO+O2 has the rate constant k=k= 0.63 M^−1s^−1 Part A: Based on the units for k, is the reaction first or second order in NO2? Part B:  If the initial concentration of NO2 is 0.124 M, how would you determine how long it would take for the concentration to decrease to 3.10×10−2 M? Express your answer using two significant figures

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