A Quick Guide to Mole Conversions in Chemistry

By John T. Moore, Chris Hren, Peter J. Mikulecky

Part of U Can: Chemistry I For Dummies Cheat Sheet

Moles are always challenging to deal with, and in a general chemistry class, you usually end up having to perform a lot of conversions involving moles (mol). Whether you’re converting from moles to grams, moles to volume, or moles to particles (atoms or molecules), use this quick guide to remind you of how to do each type of mole conversion:

  • From mass (grams) to moles: Divide your initial mass by the molar mass of the compound as determined by the periodic table.

    From moles to mass (grams): Multiply your initial mole value by the molar mass of the compound as determined by the periodic table.

  • From volume (liters) to moles: Divide your initial volume by the molar volume constant, 22.4 L.

    From moles to volume (liters): Multiply your mole value by the molar volume constant, 22.4L.

  • From particles (atoms, molecules, or formula units) to moles: Divide your particle value by Avogadro’s number, 6.02 × 1023. Remember to use parentheses on your calculator!

    From moles to particles (atoms, molecules, or formula units): Multiply your mole value by Avogadro’s number, 6.02 × 1023.

  • Mole-to-mole conversions: Use the coefficients from your balanced equation to determine your conversion factor. Be sure your units cancel out so you end up with the correct mole value.