Molality calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
b = n ÷ kg
Where this usually goes wrong
Per kilogram of SOLVENT, not of solution — that is the whole difference from molarity, and it is what the question is testing.
Worked example
0.5 mol in 2 kg of solvent is 0.25 mol/kg.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
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