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The half-life of the radioactive element unobtanium-29 is 20 seconds. If 80 grams of unobtanium-29...

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The half-life of the radioactive element unobtanium-29 is 20 seconds. If 80 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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