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  3. the radioactive isotope of lead, pb-209, decays at

The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present...

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The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.3 hours. If 1 gram of this isotope is present initially, how long will it take for 85% of the lead to decay? (Round your answer to two decimal places.) hr

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