Molar Mass
| Formula / Notation | M = m/n; SI: g/mol; e.g., H₂O: 18.015 g/mol |
|---|---|
| Also Known As | Molecular weight (loosely), formula weight, M (molar mass), gram-molecular weight |
What is Molar Mass?
The mass of one mole of a substance, expressed in g/mol. Numerically equal to the atomic or molecular mass in atomic mass units (amu). Molar mass is used to convert between grams and moles and is essential for stoichiometric calculations.
Formula & Notation
Other Names / Synonyms: Molecular weight (loosely), formula weight, M (molar mass), gram-molecular weight
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The mass of one mole of a substance, expressed in g/mol. Numerically equal to the atomic or molecular mass in atomic mass units (amu). Molar mass is used to convert between grams and moles and is essential for stoichiometric calculations.
Molar mass is fundamental to: stoichiometric calculations (n = m/M), preparing molar solutions, converting between mass and amount of substance in all quantitative analytical work, and in determining molecular formulas from empirical formula and molar mass data (from MS, osmometry, or cryoscopy).
No direct safety concern. Molar mass calculation errors propagate into wrong amounts of reagents being weighed — a critical quality and safety issue in pharmaceutical manufacturing, where exact dosage depends on correct molar mass used in formulation calculations.
The formula or notation for Molar Mass is: M = m/n; SI: g/mol; e.g., H₂O: 18.015 g/mol