Molality Calculator

Calculate molality by dividing moles of solute by mass of solvent in kilograms

Input Parameters

Calculation Results

Calculation Formula

Molality (m) = Moles of Solute / Mass of Solvent (kg)

Where:
- Moles of Solute: Amount of solute in moles
- Mass of Solvent: Mass of solvent in kilograms

Molality Calculator Usage Guide

Learn how to use the Molality Calculator and understand its working principles

What is Molality?

Molality (m) is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per kilogram of solvent. It is expressed in units of mol/kg.

How to Use the Calculator

  1. Enter the number of moles of solute in the "Moles of Solute" field.
  2. Enter the mass of the solvent in kilograms in the "Mass of Solvent" field.
  3. Click the "Calculate" button to compute the molality.
  4. The result will be displayed in the "Molality (m)" field.

Example Calculation

For example, if you dissolve 0.5 moles of NaCl in 2.0 kilograms of water:

  • Moles of Solute = 0.5 mol
  • Mass of Solvent = 2.0 kg
  • Molality (m) = 0.5 mol / 2.0 kg = 0.25 mol/kg

Principle and Applications

Molality is particularly useful in situations where temperature changes might affect the volume of a solution (such as when water evaporates), unlike molarity which is based on volume. It is commonly used in colligative property calculations like boiling point elevation and freezing point depression.