Calculate the half-life of a first-order reaction if the concentration of the reactant is 0.0451 M at

Question:

Calculate the half-life of a first-order reaction if the concentration of the reactant is 0.0451 M at 30.5 seconds after the reaction starts and is 0.0321 M at 45.0 seconds after the reaction starts. How many seconds after the start of the reaction does it take for the reactant concentration to decrease to 0.0100 M ?

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