The rate constant for the second-order reaction 2NOBr(g) › 2NO (g) + Br2(g) is 0.80/M • s at 10°C. (a) Starting with a concentra- tion of 0.086 M. calculate the concentration of NOBr after 22 s. (b) Calculate the half-lives when [NOBr]o = 0.072 M and [NOBr]o = 0.054 M.

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