Formula Weight
| Formula / Notation | FW = Σ(atomic masses) |
|---|---|
| Also Known As | Molar mass, molecular weight, gram formula mass, gram formula weight |
What is Formula Weight?
Formula weight (FW) is the sum of the atomic weights of all atoms in the chemical formula of a compound, expressed in atomic mass units (amu) or grams per mole (g/mol). It is equivalent to molar mass for ionic compounds and molecular weight for molecular compounds. Formula weight is used to convert between mass and moles of a substance.
Formula & Notation
Other Names / Synonyms: Molar mass, molecular weight, gram formula mass, gram formula 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
Formula weight (FW) is the sum of the atomic weights of all atoms in the chemical formula of a compound, expressed in atomic mass units (amu) or grams per mole (g/mol). It is equivalent to molar mass for ionic compounds and molecular weight for molecular compounds. Formula weight is used to convert between mass and moles of a substance.
Preparing solutions of known concentration (molarity). Stoichiometric calculations in reactions. Converting mass to moles and vice versa. Analytical chemistry calculations. Pharmaceutical dosing calculations. Quality control in manufacturing.
Theoretical calculation — no direct safety concerns. Accuracy important for preparing reagent solutions of correct concentration.
The formula or notation for Formula Weight is: FW = Σ(atomic masses)