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Strontium-82 has a half-life of 25.0 d. If you begin with a sample having a mass of 140 g, in how many days will you

Strontium-82 has a half-life of 25.0 d. If you begin with a sample having a mass of 140 g, in how many days will you have only 17.5 g of the isotope left?

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