## Chemistry: The Molecular Science (5th Edition)

- 1g chlorine atoms $(Cl)$: Molar mass: 35.5g/mol So: $1g \times \frac{1 mol}{35.5g} = 0.0282$ moles of chlorine atoms. Which means: 0.0282 moles of atoms. - 1g chlorine molecules $(Cl_2)$: Molar mass: 71 g/mol So: $1g \times \frac{1mol}{71g} = 0.0141$ moles of chlorine molecules. - But, each chlorine molecule $(Cl_2)$ has 2 atoms, so: $n°(atoms) = 0.0141$ $moles$ $* 2 = 0.0282$ $moles$. Therefore, they both have the same number of atoms.