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Mathematics, 05.07.2019 01:30 kallee10

My notes oask your tea 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 answel to two decimal places.) hr

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