Question

How many moles of silver atoms are in 2.8 x 10^20 of silver?

Answer 1

recall that one mole of any substance is equal to Avogadro's number, which is
6.02 x 10^23
this number can be atoms, molecules, ions, etc.
to get the number of moles, we just divide the given by the Avogadro's number:
2.8 x 10^20 / 6.02 x 10^23 = ?

Answer 2

4.65x10^-4mol