The first-order rate constant for the decomposition of a certain antibiotic in water at 20oC is 1.65 yr-1.  (a) If a 6.0 x 10-3 M solution of the antibiotic is stored at 20oC, what will its concentration be after 3 months?  (b)  After 1 year?  (c) How long will it take for the concentration of the solution to drop to 1.0 x 10-3 M?  (d) What is the half-life of the antibiotic solution?

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