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The half-life of 27Co60 is about 5.27 years. 15.8 years is 3 half-lives, so 0.53 or 0.125 of the original sample of 16 g will remain, that being 2 g.

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βˆ™ 13y ago
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βˆ™ 2w ago

After 15.8 years, half of the original sample of 60Co would have decayed. This means that 8 grams of the original 16 gram sample will remain unchanged after that time period.

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Q: What total mass of a 16 gram sample of 60co will remain unchanged after 15.8 years?
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