How this calculator works
Molality is m = n/mass of solvent (kg).
Formula
m=n/m_solventMolal concentration from amount of solute in moles and solvent mass in kilograms.
Worked example
Verified example is a verified test case used by the calculation engine.
Assumptions and limitations
- Solvent mass must be greater than zero.
- Use solvent mass rather than total solution mass.
- Use moles and kilograms for a result in mol/kg.
Methodology & sources
This calculator uses deterministic, versioned calculation logic. The formula and verified examples above are part of the calculation definition used by CalcuMint. Technical calculation version: 1.
- CalcuMint deterministic chemistry engine
Frequently asked questions
Does molality use solution volume?
No. Molality uses the mass of the solvent in kilograms.
Can solvent mass be zero?
No. The formula divides by solvent mass, so it must be positive.