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Calculate Molecular Weight
About Molecular Weight
Molecular weight (MW) is the sum of the atomic weights of all atoms in a molecule. It's expressed in atomic mass units (amu) or grams per mole (g/mol).
MW = Σ(Atomic Weight × Number of Atoms)
Common applications:
- Converting between mass and moles
- Calculating solution concentrations
- Determining empirical and molecular formulas
- Stoichiometric calculations
Example - Water (H₂O):
MW = 2(1.008) + 1(15.999) = 18.015 g/mol
Molecular weight is fundamental in chemistry for quantitative analysis, reaction stoichiometry, and solution preparation.