2A → B  is second order in A with a rate constant of 31.7 M−1 · s−1 at 25°C.   (a) Starting with [A]0 = 0.00713 M, how long will it take for the concentration of A to drop to 0.00180 M?    (b) Calculate the half-life of the reaction for [A]0 = 0.00713 M.    (c) Calculate the half-life of the reaction for [A]0 = 0.00203 M.

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