The first order rate constant for the decomposition of a certain hormone in water at 25C is 3.42 x 10^-4 day^-1  1. If a .02 M solution of the hormone is stored at 25C for 2 months, what will its concentration be at the end of that period?  2. How long will it take for the concentration of the solution to drop from .02 M to .0035 M?  3. What is the half-life of the hormone?

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Q: how much time is required for 50% of the initial quantity of reactant to be consumed?

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