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I need help on this one Radioactive plutonium 239(t21=2.44105yr) is used in nuclear reactors and atomic bombs. If there are 6.00102g of the isotope in

I need help on this one
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Radioactive plutonium 239(t21=2.44105yr) is used in nuclear reactors and atomic bombs. If there are 6.00102g of the isotope in a small atomic bomb, how long will it take for the substance to decay to 1.00102g, too small an amount for an effective bomb? Round your answer to 3 significant digits. (Hint: Radioactive decays follow first-order kinetics.)

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