The nucleus 124 55 cs has a half-life of 308 s and a molar


The nucleus 124 55 Cs has a half-life of 30.8 s and a molar mass of 124 g.

(a) How many nuclei will be present if we have a pure initial sample of mass 20 ?g?.

(b) How many nuclei 12455 Cs of are present 3.50 minutes later?

(c) What is the initial activity (decay rate) of the sample?

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Physics: The nucleus 124 55 cs has a half-life of 308 s and a molar
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