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. 
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Helmenstine, Anne Marie, Ph.D. "Molar Definition in Chemistry (Unit)." ThoughtCo, Aug. 27, 2020, thoughtco.com/definition-of-molar-605358. Helmenstine, Anne Marie, Ph.D. (2020, August 27). Molar Definition in Chemistry (Unit). Retrieved from https://www.thoughtco.com/definition-of-molar-605358 Helmenstine, Anne Marie, Ph.D. "Molar Definition in Chemistry (Unit)." ThoughtCo. https://www.thoughtco.com/definition-of-molar-605358 (accessed April 13, 2021).