1 Given data :-
• Atoms of gold in gold ring =N= 1.810^24
,
• 1 mole of any substance contains Avagadro's number of atoms.
,
• Avagadro's number = NA = 6.02 x 10^23
2. Calculate number of moles :
number of moles (n) = number of atoms (N) / Avagadro's number (NA)
=1.810^24 /6.02 x 10^23
=18/6.02
=2.999
≈3 moles of Au
• This means that a gold ring that contains 1.806 x 1024 atoms of gold (Au) has 3 moles . Option 4 i