Molality Calculator
Calculate Molality
From Mass & Molar Mass
Molarity to Molality
Convert molarity to molality using solution density
Formula
m = moles of solute / kg of solvent | m = (M × 1000) / (1000d - M × Mw)
Frequently Asked Questions
What is molality?
Molality (m) is the number of moles of solute per kilogram of solvent. Unlike molarity, it does not change with temperature because it is based on mass rather than volume. The unit is mol/kg.
What is the difference between molality and molarity?
Molarity (M) = moles of solute / liters of solution. Molality (m) = moles of solute / kilograms of solvent. Molality is preferred for colligative property calculations because it is temperature-independent.
When is molality used?
Molality is commonly used in colligative property calculations such as freezing point depression, boiling point elevation, and osmotic pressure, because these properties depend on the ratio of solute to solvent particles.
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