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.
Chemists use a Standard Temperature and Pressure (STP) when doing conversions.
- STP = 1 degrees C (or 273 K) and 1 atm of pressure.
- 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.
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