Calculate the half-life in s of a first-order reaction if, Ask an Expert

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Calculate the half-life (in s) of a first-order reaction if the concentration of the reactant is 0.0654 M 18.4 s after the reaction starts and is 0.0112 M 82.9 s after the reaction starts. And, Suppose the half-life is 72.8 s for a first order reaction and the reactant concentration is 0.0780 M 55.1 s after the reaction starts. How many seconds after the start of the reaction does it take for the reactant concentration to decrease to 0.0103 M?

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