Cesium-137 has a half-life of 30 years you begin with a 200, Chemistry

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Cesium-137 has a half-life of 30 years you begin with a 200

Cesium-137 has a half-life of 30 years. You begin with a 20.0 g sample of Cs-137. How many half-lives occur if you wait a total of 60 years? (do not include units in this box; enter your answer to 1 sig fig) How many grams of Cs-137 would remain after waiting 60 years?

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Chemistry: Cesium-137 has a half-life of 30 years you begin with a 200

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