MMolar Mass Calculator
Molar mass is the mass of one mole (6.022 × 10²³ particles) of a substance, expressed in grams per mole (g/mol). It equals the sum of the atomic masses of all atoms in the molecular formula. Molar mass is essential for stoichiometry — calculating how much of each substance reacts or is produced in a chemical reaction.
- 1Molar mass = sum of (atomic mass × count) for each element
- 2Atomic masses are from the IUPAC periodic table (in amu = g/mol)
- 3H₂O: 2 × 1.008 + 16.00 = 18.016 g/mol
- 4Avogadro's number: 1 mole = 6.022 × 10²³ molecules
- 5n = m / M: moles = mass (g) / molar mass (g/mol)
H₂O (water)=18.02 g/mol2H(1.008) + O(15.999) = 18.015
NaCl (table salt)=58.44 g/molNa(22.99) + Cl(35.45) = 58.44
C₆H₁₂O₆ (glucose)=180.16 g/mol6×12.011 + 12×1.008 + 6×15.999
| Compound | Formula | Molar Mass |
|---|---|---|
| Water | H₂O | 18.02 g/mol |
| Carbon dioxide | CO₂ | 44.01 g/mol |
| Table salt | NaCl | 58.44 g/mol |
| Ethanol | C₂H₅OH | 46.07 g/mol |
| Glucose | C₆H₁₂O₆ | 180.16 g/mol |
| Aspirin | C₉H₈O₄ | 180.16 g/mol |
| Sodium bicarbonate | NaHCO₃ | 84.01 g/mol |
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