Answer:
8.9x10¹⁷ atoms of Al are present
Explanation:
To find the number of atoms from the mass of an atom we must convert, as first, the mass to moles using the molar mass of the atom (26.98g/mol For Aluminium).
Then, we must convert the moles to atoms knowing that 1mol = 6.022x10²³ atoms.
Moles Aluminium:
4.0x10⁻⁵g * (1mol / 26.98g) = 1.483x10⁻⁶ moles Al
atoms:
1.483x10⁻⁶ moles Al * (6.022x10²³ atoms / mol) =
8.9x10¹⁷ atoms of Al are present
