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The mass of one mole of Carbon-11 is 11.0142 grams. Carbon-11 is radioactive, undergoing positron emission...

The mass of one mole of Carbon-11 is 11.0142 grams. Carbon-11 is radioactive, undergoing positron emission with a half-life of 20.4 minutes. A particular sample initially contains 4.10 micrograms of pure 11C.

(a) Calculate the number of radioactive nuclei initially present in the sample.
nuclei

(b) Calculate the initial activity of the sample.
Bq

(c) Calculate the activity of the sample after 8.40 hours.
Bq

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