05 / 08
Calculate moles and molarity from solute mass, molar mass, and final solution volume in litres or millilitres.
FormulaMolarity (mol/L) = mass (g) ÷ molar mass (g/mol) ÷ volume (L)
Calculated result
Result—Enter valid values
A
How the calculation works
The solute mass is divided by its molar mass to obtain moles. Moles are then divided by the final solution volume in litres to obtain amount concentration, commonly called molarity.
B
Limits and responsible use
Use the molar mass of the actual chemical form, including hydration state where applicable. The final volume is the completed solution volume, not merely the solvent volume. This tool does not account for assay purity unless you correct the entered mass first.
Formula reference
The calculation and interpretation are presented with their assumptions so the result can be independently checked.
View IUPAC Gold Book: amount concentration ↗