$${(\text{aatomite arv objektis}) = \frac{\text{objekti mass}\, M_{objekt}}{\text{aatommass}} \\ = \frac{\text{objekti mass}\, M_{objekt}}{(\text{molaarmass}\, M)/N_A} \\ = \frac{(\text{materjali tihedus})(\text{objekti ruumala}\, V)}{(\text{molaarmass}\, M)/N_A}}$$