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