The decomposition of a certain insecticide in water at 12 °C follows first-order kinetics with a rate constant of 1.45 yr-1. Aquantity of this insecticide is washed into a lake on June 1, leading to a concentration of 5.0 x 10-7 g/cm3. Assume thatthe temperature of the lake is constant (so that there are no effects of temperature variation on the rate). (a) What is theconcentration of the insecticide on June 1 of the following year? (b) How long will it take for the insecticide concentration todecrease to 3.0 x 10- 7 g/cm3?

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