8.0mg of a radioisotope of half-life 30 minutes is used for 12 minutes. What is the amount of the radioisotope remaining?

General, Organic, and Biological Chemistry
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Chapter11: Nuclear Chemistry
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 8.0mg of a radioisotope of half-life 30 minutes is used for 12 minutes.

What is the amount of the radioisotope remaining?

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