Molality calculator
Molality is moles of solute divided by the mass of solvent in kilograms, so unlike molarity it is unaffected by thermal expansion.
g/mol
Molality
1mol/kg
- Moles of solute
- 1 mol
Show the working
- Mass of solute = 58.44
- Molar mass of solute = 58.44
- Mass of solvent = 1
- Moles of solute = 58.44 / 58.44 = 1
- Molality = 1 / 1 = 1
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- moles = mass / molar mass
- molality b = moles / mass of solvent in kg
Molality uses the mass of the solvent alone, not the mass of the finished solution.
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