Formula verified · Deterministic calculation

Molality Calculator

Calculate molality from the amount of solute in moles and the mass of solvent in kilograms. This certified deterministic calculator keeps solvent mass distinct from total solution mass.

MolesSolvent mass (kg)

Molality0.5 mol/kg

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Result methodology

Deterministic calculation using the displayed chemistry concentration formula. Molality = 0.5

How this calculator works

Molality is m = n/mass of solvent (kg).

Formula

m=n/m_solvent

Molal 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.

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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.