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The half-life of the radioactive element unobtanium-29 is 20 seconds. If 176 grams of unobtanium-29 are initially present, how many grams are present after 20

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The half-life of the radioactive element unobtanium-29 is 20 seconds. If 176 grams of unobtanium-29 are initially present, how many grams are present after 20 seconds? 40 seconds? 60 seconds? 80 seconds? 100 seconds? . . ... The amount left after 20 seconds is |grams

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