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What is the half life of a radioisotope if a 100g sample becomes 25g after 18 years?

Updated: 4/28/2022

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Q: What is the half life of a radioisotope if a 100g sample becomes 25g after 18 years?

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If 12.5 grams of the original sample of cesium-137 remained after 90.69 years what was the mass of the original sample?

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What is the half life of a radioisotope if a 100g sample becomes 50 g after 20 years?

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If 12.5 grams of the original sample of cesium-137 remained after 90.69 years what was the mass of the original sample?

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A compound is 80.0 carbon and 20.0 hydrogen by mass Assume a 100g sample of this compound How many grams of each element are in this sample?

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