Molarity Calculator
Calculate moles, molarity and concentration from mass and volume.
Results
Molarity is the number of moles of solute per liter of solution - the most common concentration unit in chemistry. To prepare a solution, you need to know the mass of solute, its molar mass and the final volume. This calculator does the math for you, converting between grams, moles and molarity for any solute.
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Frequently asked questions
Dissolve 58.44 g of NaCl (one molar mass) in enough water to make exactly 1 liter of solution. The molar mass of NaCl is 22.99 + 35.45 = 58.44 g/mol.
Moles = 5.84 / 58.44 = 0.0999 mol. Molarity = 0.0999 / 0.1 L = 0.999 M, essentially a 1 M solution in 100 mL.
Multiply molarity by molar mass. A 0.5 M NaCl solution contains 0.5 × 58.44 = 29.22 grams per liter.
Molarity (M) is moles per liter of solution. Molality (m) is moles per kilogram of solvent. Molality is temperature-independent because it uses mass, not volume.
Glucose molar mass is 180.16 g/mol. For 1 liter at 0.1 M, you need 0.1 × 180.16 = 18.016 grams. For 500 mL, halve that to 9.008 grams.