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The radioactive plutonium isotope, 239Pu, has an half-life of 24 100 years and undergoes alpha decay....

The radioactive plutonium isotope, 239Pu, has an half-life of 24 100 years and undergoes alpha decay. The molar mass of 239Pu is 239.0521634 amu. The sample initially contains 10.0 g of 239Pu.

(a) Calculate the number of moles of 239Pu that are left in the sample after 15 000 years. (4)

(b) Determine the activity of 239Pu after 15 000 years, in units of Bq.

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