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200 ug > 100 ug > 50 ug > 25 ug. That's 3 half lifes.

3 half lives x 67 hours/ half life = 201 hours

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โˆ™ 2012-11-26 16:09:38
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Q: The half-life of Mo-99 is 67 hours A 200 ug quantity decays over time to 25 ug How much time has elapsed?
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