Convert the following quantities to moles

Question

1. 5.8 x 10¹⁸ molecules of N₂
2. 3.2 x 10²⁸ atoms of Au
3. 7.9 x 10⁶ formula units of NaCl
4. 8.1 x 10²⁹ molecules of H2O
5. 1.4 x 10¹⁰ atoms of Fe

Answer 1

All 5 examples are done the same way. Divide the number of molecules (or formula units or atoms) by Avogadro's number to get the number of moles. I will set up the first one:

(1)

(5.8 x 10¹⁸) / (6.02 x 10²³) = ?