Question

Calculate the number of atoms in a 0.123-gram sample of aluminium foil.​

Answer 1

The atomic mass of Al is 27 g/mol.

Hence, 27 g of Al corresponds to 1 mole.

1 mole of any element contains Avogadro's number of atoms.

Hence, 27 g ( 1 mole ) of Al contains 6.02×10

26atoms.