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21-12-2022
Chemistry

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plutonium isotope 239pu decays by alpha decay with a half-life of 24 100 y. how many milligrams of helium are produced by an initially pure 12.0 g sample of 239pu at the end of 20 000 y? (consider only the helium produced directly by the plutonium and not by any by-products of the decay process.)

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