Flexi Says: A mole of any substance contains Avogadro’s number (6.02 × 1023) of atoms. To convert the number of atoms to number of moles we need to use the conversion factor: number of atoms x 1 mole / 6.023 x 1023 atoms. In other words, divide the number of atoms by 6.023 x 1023 to get the number of moles.