Question

How many atoms are in 4.0 x 10ˉ⁵ grams of Al?

Answer 1

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