3. A reaction having a first-order rate has a rate constant of 4.00 x 10° s'. a. Determine the half-life. b. How long will it take for a sample of reactant at 1.0 M to decrease to 0.25 M? c. What concentration of the 1.0M sample of reactant would you expect to be present after it has reacted for 500 s?

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