A chemical compound used in water treatment has a half-life of 8 years. The initial amount of the compound is 80 grams. How much of the compound will remain after 16 years?

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20 grams. The compound undergoes radioactive decay, reducing by half every 8 years. Therefore after 16 years, which represent two half-lives: \ul{\begin{array}{rl} 	ext{First half-life:} & 80 	ext{ grams} 	o 40 	ext{ grams} \ 	ext{Second half-life:} & 40 	ext{ grams} 	o 20 	ext{ grams} \ \end{array}} \ Therefore, the compound reduces to 20 grams after 16 years.

A chemical compound used in water treatment has a half-life of 8 years. The initial amount of the compound is 80 grams. How much of the compound will remain after 16 years?

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