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Nitrogen dioxide undergoes thermal decomposition according to the second-order reaction:2NO2(g)"2NO (g)+ O2(g). When 0.500 M NO2is allowed to react for 90.0 seconds, its concentration falls to 0.0196 M. What is the rate constant for the reaction? A.0.545 M−1s−1. D.0.0214 M−1s−1. B.0.589 M−1s−1. E.0.0231 M−1s−1. C.0.00534 M−1s−1