Weight of Cl2 = 71 g Molecular weight of Cl2 = 71 g/mol Number of moles of Cl2 =
71g
71g∕gatom
= 1 moles The Avogadro's number is 6.023 × 1023 molecules/mol. The number of atoms of Cl2 = 2 atoms/molecule × 1 mol × 6.023 × 1023 molecules/mol = 1.205 × 1024 atoms