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Molality Calculator (m = mol / kg)
Calculates molality m = n / mass_solvent in mol/kg, essential for colligative property calculations.
Molality Concentration Calculator (m = n / m_solvent)
Moles of solute dissolved per kilogram of pure solvent
Volumetric Solution Model
Calculated Molal Concentration
0.5000 mol/kg (m)
1. Solute Quantity: n = 0.25 mol = 0.2500 moles 2. Solvent Mass: m_solvent = 0.5 kg = 0.5000 kg 3. Molality: m = n / m_solvent = (0.2500 mol) / (0.5000 kg) = 0.5000 mol/kg (molal)
What is Molality?
Molality is the moles of solute per kilogram of solvent. Unlike molarity, molality does not change with temperature.
Formula & Step-by-Step Calculation
m = n_solute / m_solvent (kg)
Moles of solute divided by mass of solvent in kilograms.
Worked Step-by-Step Examples
Example 1
0.25 moles of sucrose in 0.5 kg of water
Solution: 0.500 mol/kg (0.500 m)
• 0.25 mol / 0.5 kg = 0.500 m
Common Real-World & Academic Use Cases
- ✓ Freezing point depression (antifreeze)
- ✓ Boiling point elevation
- ✓ Colligative properties thermodynamics
How to Use the Molality Calculator (m = mol / kg)
1
Enter Moles of Solute
Input n in mol.
2
Enter Mass of Solvent
Input kg of solvent.
3
Read Molality
Inspect mol/kg.
Frequently Asked Questions
Q: Why use molality over molarity?
Because mass does not expand or contract with temperature changes, making molality constant across wide temperature ranges.