Approximately how many moles of chlorine make up 1.79 * 1023 atoms of chlorine?

1.2*10^24# atoms of chlorine

Explanation:

Chlorine gas (#Cl_2#) has two atoms of elemental chlorine in a molecule, so:

#1# mol of #Cl_2# have #6*10^23# molecules of #Cl_2#

#1# molecule of #Cl_2# have #2# atoms per molucule

Then #2*6*10^23 = 1.2*10^24# atoms of chlorine in a mol of chlorine gas