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Question 21 (2 points) A sample originally contains 120 grams of a radioactive isotope. After 220 days, 74.8 grams of the isotope remain in the

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Question 21 (2 points) A sample originally contains 120 grams of a radioactive isotope. After 220 days, 74.8 grams of the isotope remain in the sample. What is the half life of the isotope? Round your answer to the nearest day. DO NOT write the word day in your answer. A

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