Final answer:When Sodium-24 decays over the course of 65 hours, about 0.75 grams would remain, given its half-life of 15 hours.Explanation:To solve this problem, it's crucial to understand the nature of radioactive decay, specifically,half-life. Half-life refers to the time it takes for half of a certain substance to decay. In this case,Sodium-24has a half-life of 15 hours.So, after every 15 hours, the mass of Sodium-24 reduces to its half. After 65 hours or roughly 4.33 half-life times:After 15 hours (1 half-life), it would reduce to 9.0 gAfter 30 hours (2 half-lives), it would further reduce to 4.5 gAfter 45 hours (3 half-lives), it would again reduce to 2.25 gAfter 60 hours (4 half-lives), it would become 1.125 gFor the remaining 5 hours, we'll need to calculate the proportion of that time to a full 15-hour half-life (5/15 = 1/3) and reduce the sodium accordingly. So, roughly, the amount of sodium left after 65 hours would be about 1.125*(2/3) = 0.75 g.Learn more about Half-life here:brainly.com/question/31375996#SPJ4...

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