(Answered) Sodium-24 which is used to locate blood clots in the human

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Sodium-24, which is used to locate blood clots in the human circulatory system, has a half-life of 15.0 hours. A sample of sodium-24 with an inital mass of 13.0 g was stored for 45.0 hours. How many grams of sodium-24 is left in the sample after 45.0 hours?

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