Molar Mass
Definition
The mass of one mole of a substance, expressed in grams per mole (g/mol). Equal to the atomic/molecular weight read from the periodic table.
Why is Molar Mass Important?
Molar Mass is an essential chemistry concept used in laboratories, pharmaceutical development, environmental science, and industrial processes. Understanding this concept is critical for accurate chemical calculations, safe laboratory practices, and optimizing reactions.
Our chemistry calculators provide instant, accurate results for complex conversions and calculations, making lab work more efficient and reducing the risk of errors in critical measurements.
What is Molar Mass?
Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). For elements, it equals the atomic weight on the periodic table. For compounds, add the molar masses of all atoms in the formula.
How to Calculate Molar Mass
Example: Sulfuric acid (H₂SO₄)
| Element | Atomic Mass | Count | Subtotal |
|---|---|---|---|
| H | 1.008 | 2 | 2.016 |
| S | 32.06 | 1 | 32.06 |
| O | 16.00 | 4 | 64.00 |
| Total Molar Mass | 98.08 g/mol | ||
Common Molar Masses
| Substance | Formula | Molar Mass (g/mol) |
|---|---|---|
| Water | H₂O | 18.015 |
| Carbon dioxide | CO₂ | 44.01 |
| Sodium chloride | NaCl | 58.44 |
| Glucose | C₆H₁₂O₆ | 180.16 |
| Ethanol | C₂H₅OH | 46.07 |
| Aspirin | C₉H₈O₄ | 180.16 |
| Caffeine | C₈H₁₀N₄O₂ | 194.19 |