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Calculate molar mass from any chemical formula. Enter a compound like H2O or C6H12O6 to get the molecular weight with element-by-element breakdown.
Molar mass is the mass of one mole (6.022 × 10²³ particles) of a substance, equal to the sum of the atomic masses of all atoms in its chemical formula, measured in grams per mole (g/mol).
| Compound | Formula | g/mol |
|---|---|---|
| Water | H₂O | 18.015 |
| Carbon Dioxide | CO₂ | 44.009 |
| Glucose | C₆H₁₂O₆ | 180.156 |
| Sodium Chloride | NaCl | 58.443 |
| Ethanol | C₂H₅OH | 46.068 |
| Sulfuric Acid | H₂SO₄ | 98.079 |
Formula
M = Σ (nᵢ × Aᵢ)M = Molar mass of the compound (g/mol)
nᵢ = Number of atoms of element i in the formula
Aᵢ = Atomic mass of element i
Worked Example
Molar mass of H₂SO₄
Did you know? The mole was officially added to the International System of Units (SI) in 1971, and in 2019 it was redefined to be exactly 6.02214076 × 10²³ entities (source: BIPM – Bureau International des Poids et Mesures).
Sources
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