unit-converters Verified Precision Tool
Molar Mass Calculator
Calculate molar mass, molecular weight, and mass percentage breakdown from chemical formulas.
Chemistry & Stoichiometry
Molar Mass Calculator
Calculate molecular weight and elemental mass percentage breakdown from any chemical formula.
Total Molar Mass
18.015 g/mol
| Element | Symbol | Atomic Weight | Count | Total Mass | Mass % |
|---|---|---|---|---|---|
| Hydrogen | H | 1.008 | 2 | 2.016 g/mol | 11.19% |
| Oxygen | O | 15.999 | 1 | 15.999 g/mol | 88.81% |
Mathematical Formula
Molar Mass = Sum of (Atomic Weight of Element times Element Count)
Overview & Explanation
Calculates total molecular weight and elemental mass percentage breakdown from standard IUPAC atomic weights.
How It Works
- Parses chemical formula string using element symbol capitalization rules.
- Multiplies atom counts by elemental atomic weights.
- Computes total molar mass in grams per mole (g/mol).
Practical Applications
- Chemistry lab solution preparation.
- Stoichiometric reaction stoichiometry.
Worked Example: Molar Mass of Water (H2O)
Calculate molecular weight of H2O.
1
Hydrogen Mass
2 times 1.008 g/mol
= 2.016 g/mol (11.19%)
2
Oxygen Mass
1 times 15.999 g/mol
= 15.999 g/mol (88.81%)
3
Total Mass
2.016 + 15.999
= 18.015 g/mol
Frequently Asked Questions
What are the units of molar mass?
Molar mass is measured in grams per mole (g/mol).
Is the formula parser case sensitive?
Yes. Elements must start with a capital letter (e.g., Na for Sodium, NaCl for Sodium Chloride).
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