What is molar mass?
Molar mass is the mass of one mole of a substance, expressed in g/mol. One mole contains Avogadro's number (6.022 × 10²³) of particles. The molar mass of a compound equals the sum of the molar masses of all the atoms in its formula.
How to calculate molar mass
- Write the chemical formula (e.g., H2O, NaCl, C6H12O6).
- Look up the atomic mass of each element from the periodic table.
- Multiply each element's atomic mass by its subscript count.
- Sum all contributions.
Example: H₂O = (2 × 1.008) + (1 × 15.999) = 18.015 g/mol.