Molarity Calculator

5.844 g of a solute with molar mass 58.44 g/mol in 1 L gives 0.1 mol and a molarity of 0.1 mol/L.

How it works

• Divided the solute mass by its molar mass to get the amount in moles (n = m / M).
• Divided the moles by the solution volume in litres to get the molarity (c = n / V).

c = n / V = (m / M) / V = (5.844 g / 58.44 g/mol) / 1 L = 0.1 mol/L

• Molarity is moles of solute per litre of solution, not per litre of solvent.
• The result assumes the volume is the final solution volume at the measurement temperature.

Methodology

1. Convert the solute mass to moles: n = m / M, where M is the molar mass in g/mol.
2. Divide the moles by the solution volume in litres: c = n / V, giving mol/L.
3. Round the result to 12 significant digits.

Usage

1. Enter the solute mass in grams.
2. Enter the molar mass in g/mol.
3. Enter the solution volume in litres and read the moles and molarity.

Examples

These are examples, not current values: they use fixed inputs, while the interactive tool computes live results in your browser.

0.1 mol/L sodium chloride

{
  "mass": 5.844,
  "molarMass": 58.44,
  "volume": 1
}

Glucose solution

{
  "mass": 18.016,
  "molarMass": 180.16,
  "volume": 0.5
}

Concentrated stock

{
  "mass": 98.08,
  "molarMass": 98.08,
  "volume": 0.25
}

Limitations

The mole

The mole is the SI unit of amount of substance and links a mass to a count of entities through the molar mass. Molarity is the derived concentration unit mol/L, used across chemistry for solution preparation and dilution.