Given the atoms of Chlorine, Cl = [tex]1.79 *10^{23} atoms Cl[/tex]
1 mol of any substance has Avagadro number of formual units (atoms, molecules, ions)
[tex]6.022 * 10^{23} Cl atoms[/tex] are present per each mole chlorine.
The conversion factor used to convert atoms to moles of chlorine is,
[tex]\frac{1 mol Cl}{6.022*10^{23} Cl atoms }[/tex]
Calculating the moles of Cl that make up [tex]1.79 *10^{23} atoms Cl[/tex]:
[tex]1.79 *10^{23} atoms Cl[/tex] *[tex]\frac{1 mol Cl}{6.022*10^{23} Cl atoms }[/tex]=0.279 mol Chlorine
Therefore, 0.297 mol Cl make up [tex]1.79 *10^{23} atoms Cl[/tex]