If 20.0% of a sample of zinc-65 decays in 69.9 d, what is the half-life of this

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If 20.0% of a sample of zinc-65 decays in 69.9 d, what is the half-life of this isotope (in days)?
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General Chemistry

ISBN: 978-1439043998

9th edition

Authors: Darrell Ebbing, Steven D. Gammon

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