Question

Find the number of atoms in 237g Cu (molar mass of Cu63.55g/mol)

Answer 1

In order to find the amount of atoms you have to find the moles then multiply by Avogadro's Constant (L)

mol =
`(MASS)/(Molar Mass)`

=
`(237 g)/(63.55 g/mol)`

= 3.73 mol

Number of atoms of Cu = mol × L

= 3.73 mol × (6.02 × 10²³)

= 2.245 × 10²⁴ atoms of copper