In order to find the amount of atoms you have to find the moles then multiply by Avogadro's Constant (L)
mol = [tex] \frac{MASS}{Molar Mass}[/tex]
= [tex] \frac{237 g}{63.55 g/mol}
[/tex]
= 3.73 mol
Number of atoms of Cu = mol × L
= 3.73 mol × (6.02 × 10²³)
= 2.245 × 10²⁴ atoms of copper
