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It has been found that DDT in the soil decomposes by a first-order reaction with a half-life of 12.0 years. How long would it take

It has been found that DDT in the soil decomposes by a first-order reaction with a half-life of 12.0 years. How long would it take DDT in a soil sample to decompose from a concentration of 415 ppbm (parts per billion by mass) to 15 ppbm?

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