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If the concentration of a reactant is 0.0560 M 25.5 seconds after a reaction starts and...

If the concentration of a reactant is 0.0560 M 25.5 seconds after a reaction starts and is 0.0156 M 60.5 seconds after the start of the reaction , how many seconds after the start of the reaction does it take for the reactant concentration to decrease to 0.00450 M? Assume the reaction is first       order in this reactant.

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