## Question

###### Plutonium isotope ${ }^{239}$ Pu decays by alpha decay with a halflife of $24100 mathrm{y}$. How many milligrams of helium are produced by an initially pure $12.0 mathrm{~g}$ sample of ${ }^{239} mathrm{Pu}$ at the end of $20000 mathrm{y}$ ? (Consider only the helium produced directly by the plutonium and not by any by-products of the decay process.)

Plutonium isotope ${ }^{239}$ Pu decays by alpha decay with a halflife of $24100 mathrm{y}$. How many milligrams of helium are produced by an initially pure $12.0 mathrm{~g}$ sample of ${ }^{239} mathrm{Pu}$ at the end of $20000 mathrm{y}$ ? (Consider only the helium produced directly by the plutonium and not by any by-products of the decay process.)

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