Enter your moles of solute (or let the calculator figure them out from mass of solute and molar mass), then add the mass of solvent in your preferred solvent mass unit — the Molality Calculator returns the molality of your solution along with the resolved moles of solute and solvent mass.
Molality
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Moles of Solute
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Solvent Mass
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Molarity is moles of solute per liter of solution, while molality is moles of solute per kilogram of solvent. Molality is temperature-independent because mass doesn't change with temperature, unlike volume.
Molality = moles of solute ÷ mass of solvent (kg). First determine moles of solute (either directly or from mass ÷ molar mass), then divide by the solvent mass in kilograms.
Molality = 3 mol ÷ 0.5 kg = 6 mol/kg. This means there are 6 moles of solute per kilogram of solvent.
Use the formula: molality = molarity × density ÷ (1 + molarity × molecular weight ÷ 1000). You need to know the solution density and solute molecular weight.
Molality is temperature-independent since it's based on mass, not volume. This makes it preferred for colligative properties calculations and when temperature varies.
Yes, our calculator accepts both units. If you enter grams, it will automatically convert to kilograms for the molality calculation since molality is defined per kg of solvent.
You can calculate moles from mass and molar mass. Select 'Calculate from mass and molar mass' mode, then enter the solute mass in grams and its molar mass in g/mol.