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If a reaction is first order with a rate constant of 5.48 x 10-2 sec, how long is required for 1/4 of the initial concentration

If a reaction is first order with a rate constant of 5.48 x 10-2 sec, how long is required for 1/4 of the initial concentration of reactant to be used up? Assume that initial concentration of reactant is equal to 1 M.

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