Question: 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

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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