Explanation:
An atom or object that occupies space also has mass. Molar mass or molecular weight is the mass of 1 mole of a substance.
The formula to calculate molar mass is as follows.
[tex]Molar mass = \frac{mass in grams}{mole}[/tex]
For example, molar mass of [tex]Na_{2}CO_{3}[/tex] will be as follows
[tex]2 \times mass of sodium atom + 1 \timess mass of carbon atom + 3 \times mass of oxygen atom[/tex]
= [tex](2 \times 22.99 + 1 \timess 12.01 + 3 \times 16.00[/tex]) g/mol
= (45.98 + 12.01 + 48.00) g/mol
= 105.99 g/mol
Therefore, it can be concluded that the sum of mass of all the atoms in grams make up 1 mole of a particular molecule. This mass is known as the molar mass or molecular weight.
