3.27 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], = 0.054 M.

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