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Cryoscopy: Molar Mass from Freezing Point Depression Calculator

M = Kf·mass_solute / (ΔTf·mass_solvent).

Determines the molar mass of an unknown solute from the measured freezing point depression: M = Kf × w_solute(g) / (ΔTf × w_solvent(kg)), where Kf(water) = 1.86 °C·kg/mol.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

°C·kg/mol
°C
g
kg

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

M = Kf × w_s / (ΔTf × W_solvent)

In depth

Determines the molar mass of an unknown solute from the measured freezing point depression: M = Kf × w_solute(g) / (ΔTf × w_solvent(kg)), where Kf(water) = 1.86 °C·kg/mol.