Approximately how many moles of chlorine make up 1.79 × 1023 atoms of chlorine? a. 2.97 × 10-1 moles b. 2.97 moles c. 6.02 × 1023 moles d. 17.0 moles

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