The rate constant for the decomposition of NO2  with a laser beam is 1.70M-1min-1. 2 NO2 (g)   ----------->    2 NO (g)  +  O2 (g)   a) What is the overall order of this reaction? b) Write the rate law expression for this reaction. c) How many seconds does it take for 85.0% of the NO2 to decompose if the initial concentration of NO2 was 0.695M?             What is the concentration of NO2 after 245 seconds using an initial concentration of 0.695M?

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