Calculate molar mass from a chemical formula, including grouped atoms and hydrates, using CIAAW abridged standard atomic weights.
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Case-sensitive symbols; parentheses, square brackets and hydrates such as CuSO4·5H2O are supported.
Molar mass
74.0920 g/mol
| Element | Atoms | Atomic weight | Contribution (g/mol) |
|---|---|---|---|
| Ca | 1 | 40.078 | 40.078 |
| O | 2 | 15.999 | 31.998 |
| H | 2 | 1.008 | 2.016 |
Uses CIAAW’s 2024 abridged standard atomic weights, not isotope-specific masses. Natural composition varies. Charged species, isotope notation and elements without standard atomic weights are rejected.
Parse each element’s count, including group multipliers and hydrate coefficients.
Molar mass = sum of (atom count × abridged standard atomic weight).
Sum each element’s atom count multiplied by its standard atomic weight. Group multipliers and hydrate coefficients expand the atom counts first.
H₂O contains two hydrogen atoms and one oxygen atom: 2 × 1.008 + 15.999 = 18.015 g/mol.
This parser supports standard element symbols, whole atom counts, parentheses, square brackets and hydrate dots. It rejects charges, isotope notation and elements without standard atomic weights.
Last updated . Results are estimates for informational purposes only.