The decomposition of nitrogen dioxide is second order. It takes 125 seconds for the concentration of NO2 to go from 0.800 M to XXXXXXXXXXM. 2 NO2(g) ? 2 NO(g) + O2(g) (a) What is the rate constant, k,...

The decomposition of nitrogen dioxide is second order. It takes 125 seconds for the concentration of NO2 to go from 0.800 M to 0.0104 M. 2 NO2(g) ? 2 NO(g) + O2(g) (a) What is the rate constant, k, for the reaction? (b) What is the half-life of the reaction if the initial concentration of NO2 is 0.500 M?