1) Convert atoms to moles
Avogadro's number is 6.022*10^23
[tex]molNa=18.066\cdot10^{23}atomsofNa\cdot\frac{1molNa^{}}{6.022\cdot10^{23}atoms_{}ofNa}^{}=3molNa_{}[/tex]2) Convert moles to grams
The molar mass of Na is 22.990 g/mol
[tex]gNa_{}=3molNa\cdot\frac{22.990_{}gNa}{1molNa_{}}_{}=68.97gNa_{}[/tex]There are 18.066*10^23 atoms of Na in 69 grams of Na.
