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Molality — result sheet
Calculate solution molality from solute amount and the mass of solvent in kilograms.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Molality m = solute moles / solvent mass in kg.
Molality measures dissolved solute amount relative to solvent mass. Because the denominator is a mass of solvent rather than a solution volume, this narrow calculation does not require a solution-density input.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Solute amount — mol; Enter a finite nonnegative amount of solute.; minimum 0; maximum 1000000000
- Solvent mass — kg; Use solvent mass, not total solution mass; it must be positive.; minimum 1.0E-6; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Solute amount | 0.5 |
| Solvent mass | 2 |
Molality is 0.25 mol/kg.
Assumptions and limits
- Solute amount is measured in moles and solvent mass is measured in kilograms.
- The entered solvent mass is positive and refers only to solvent, while zero solute is allowed.
- No dissociation, activity coefficient, temperature-volume relation, or solution preparation claim is modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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