Calculate Molality from Moles and Mass of Solvent
Instantly determine the molality of a solution using moles of solute and mass of solvent. Supports mol, mmol, kg, and g units. Ideal for chemistry students, lab technicians, and researchers.
Whether you’re preparing solutions in a laboratory, studying for exams, or performing chemical calculations, our free online molality calculator ensures quick, accurate, and unit-flexible results.
Where:
- m = molality (mol/kg)
- n = moles of solute (mol)
- mass of solvent = mass in kilograms (kg)
Example: 2.5 mol of NaCl dissolved in 1.5 kg of water gives molality = 2.5 ÷ 1.5 = 1.67 m
Molality (m) is a concentration unit that expresses the number of moles of solute per kilogram of solvent. Unlike molarity, molality is temperature-independent because it's based on mass rather than volume, making it ideal for studying colligative properties and temperature-dependent processes.
Molality is expressed in mol/kg or simply "m" (molal).
Temperature independent, used for colligative properties.
Molarity, Normality, Dilution calculators.
- •Chemical laboratories for precise concentration measurements
- •Colligative property studies (freezing point depression, boiling point elevation)
- •Freezing and boiling point change calculations
- •Pharmaceutical formulations and drug preparations
- •Industrial chemistry processes requiring temperature stability
- •Research involving temperature-dependent reactions