21.3 moles of barium

21.3moles of barium:

What do you want calcuated in 21.3 moles of Barium?

If you want the number of atoms, molecules, ions, or electrons, then it's:

21.3 X 6.0221413 X 10^23=1.2827160969 X 10^25 atoms, molecules.......etc.