Chemistry, 03.11.2020 01:00, sanchez626

The average atomic mass of naturally occurring rubidium is 85.468 amu. The two isotopes of naturally occurring rubidium are rubidium-85 which is 72.2% abundant
and rubidium-87 which is 27.8% abundant. A 20.56 g sample of a natural rubidium
sample contains a mixture of both isotopes. How many of the atoms in the mixture
are rubidium-85?

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The average atomic mass of naturally occurring rubidium is 85.468 amu. The two isotopes of naturall...