Molarity calculator
Find molar concentration from solute mass, molar mass and final solution volume.
Formula
n = mass (g) / molar mass (g/mol); M = n / solution volume (L)
Solute mass: 10 g · Final solution volume: 1 L · Amount (mol) ≈ (10 g × 0.001 kg/g)×1000÷(100) · Molarity (mol/L) ≈ (0.1)÷(1 L)
How to use
- Enter solute mass.
- Enter molar mass and final solution volume.
- Read moles and mol/L.
Examples
- 20 g at 40 g/mol in 250 mL gives 2 mol/L.
Frequently asked questions
Is the volume the solvent volume?
Use the final solution volume after dissolution.
Does it choose a chemical’s molar mass?
No. Enter the value for your compound, including its hydrate form if relevant.
Are purity corrections included?
No. Enter the mass of the pure solute.
Sources
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