Mole-Volume Relationships

The mass of a gas (grams) is not easy to measure. Chemists will generally use volume (liters) to measure a gas. We can use a standard conversion factor from volume to moles (22.4 Liters = 1 mole). In fact, Avogadro's Law states the following: Avogadro proposed that at equal temperature and pressure, equal volumes of gases will contain equal numbers of particles (atoms of molecules), no matter the size of the particles.

Chemists use a Standard Temperature and Pressure (STP) when doing conversions.

• STP = 1 degrees C (or 273 K) and 1 atm of pressure.​

At STP, 1 mole of gas occupies a volume of 22.4 L.

• 22.4 L/mole (22.4 Liters = 1 mole).
  • This also called the "molar volume" of gas
  • 1 mole of ANY gas at STP will take up 22.4 L.

​Watch the videos below to learn how to convert between moles and liters.
​

https://youtu.be/Cy9W82Teiic

​https://youtu.be/MjlYgYPtraE

https://youtu.be/Y8e7T09SKZ0