By Peter J. Mikulecky, Chris Hren

Part of Chemistry Workbook For Dummies Cheat Sheet

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:

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

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

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

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

  • Converting 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!

  • Converting 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.