# How to Interconvert Moles, Molarity and Volume ••• Creatas/Creatas/Getty Images

In chemistry and physics a mole describes an amount of a substance in grams equal to its atomic mass. For example, one mole of aluminum has a mass of 13 grams since it has an atomic mass of 13. Also, one mole of a substance contains Avogadro's number of atoms, namely 6.02 times 10 to the power 23. The molarity, or concentration of a solution, equals the number of moles in the solution divided by its volume. Conversion between moles, molarity and volume is performed frequently in science problems.

Calculate the molarity of a solution in moles per liter, given moles and volume in liters, by dividing the number of moles by the volume. For example, a 5.0 liter solution containing 10.0 moles has a molarity of 2.0 moles per liter.

Determine the number of moles in a solution, with molarity and volume known, by multiplying molarity in moles per liter by the volume in liters--an example being a 2.0 liter solution with a molarity of 3.0 moles per liter. There are 6.0 moles in the solution.

Compute the volume of a solution in liters, given the number of moles and molarity, by dividing the number of moles by the molarity in units of moles per liter. For example, a solution containing 6.0 moles and a having a molarity of 3.0 moles per liter has a volume of 2.0 moles per liter.

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