Molar Definition in Chemistry (Unit)

In chemistry, molar is a unit of concentration in terms of moles per liter.
In chemistry, molar is a unit of concentration in terms of moles per liter. Sean Russel / Getty Images

Molar refers to the unit of concentration molarity, which is equal to the number of moles per liter of a solution. In chemistry, the term most often refers to molar concentration of a solute in a solution. Molar concentration has the units mol/L or M.
Molar also refers to other measurements dealing with moles such as molar mass, molar heat capacity and molar volume.

Example

A 6 molar (6 M) solution of H2SO4 refers to a solution with six moles of sulfuric acid per liter of solution. Remember, the volume refers to liters of solution, not liters of water added to prepare the solution.

Sources

  • Tro, Nivaldo J. (2014). Introductory Chemistry Essentials (5th ed.). Pearson. Boston. ISBN 9780321919052.