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.
In chemistry, molar is a unit of concentration in terms of moles per liter. Sean Russel / Getty Images
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Anne Marie Helmenstine, Ph.D.
Anne Marie Helmenstine, Ph.D.
Chemistry Expert
  • Ph.D., Biomedical Sciences, University of Tennessee at Knoxville
  • B.A., Physics and Mathematics, Hastings College
Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels.
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Updated on November 07, 2019

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, Jun. 25, 2024, thoughtco.com/definition-of-molar-605358. Helmenstine, Anne Marie, Ph.D. (2024, June 25). 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 January 24, 2025).