Lesson 16

Avogadro's Law

To count the number of molecules in a specific volume of gas, the unit is counted in moles.

• 1 mole = 6.022 x 10^23 (also called Avogadro's number)
• 1 mole at standard temperature of 273°K and standard pressure of 1 atm occupies a volume of 22.4 L
• This standard temperature and pressure is abbreviated STP

Avogadro's Law - If two gases have the same pressure, volume, and temperature, then they have the same number of gas molecules independent of the identity of the gases.

Practice Problem

5) 8.0 g of helium has more atoms because 8g is two atoms and 40g of argon is only one argon atom.

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