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Molality calculator

Convert solute mass to moles using molar mass, then divide by kilograms of solvent to obtain molality independently of solution volume.

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Your result

Molality0.34mol/KG
Solute amount0.17mol

Calculator controls

How to calculate

Convert solute mass to moles using molar mass, then divide by kilograms of solvent to obtain molality independently of solution volume.

Molality = m/M/s mol/kg; Solute amount = m/M mol

Worked example

Solute mass (G): 10; Molar mass (G/mol): 58.44; Solvent mass (kg): 0.5.

Molality: 0.34 mol/kg; Solute amount: 0.17 mol.

Assumptions and limits

Convert solute mass to moles using molar mass, then divide by kilograms of solvent to obtain molality independently of solution volume. Molality uses kilograms of solvent, not solution volume. Mole fractions assume exactly the two entered components and their actual amounts.

Results are rounded for display; calculations use unrounded values. Read our calculation methodology.

Understanding the result

Convert solute mass to moles using molar mass, then divide by kilograms of solvent to obtain molality independently of solution volume.

When this tool is useful

Molality = m/M/s mol/kg; Solute amount = m/M mol

Understanding your inputs

InputWhat to enter
Solute mass (G)Enter a number of at least 0 and no more than 1000000000000.
Molar mass (G/mol)Enter a number of at least 1e-12 and no more than 1000000000000.
Solvent mass (kg)Enter a number of at least 1e-12 and no more than 1000000000000.

Frequently asked questions

What assumptions does this calculation use?

Convert solute mass to moles using molar mass, then divide by kilograms of solvent to obtain molality independently of solution volume. Molality uses kilograms of solvent, not solution volume. Mole fractions assume exactly the two entered components and their actual amounts.

How is the result calculated?

Molality = m/M/s mol/kg; Solute amount = m/M mol

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