Volume vs. Moles of Gas:Avogadro�s Law

100.0

100.0

100.0

volume mass of gas V/n

Gas (mL) (g) (L/mol)

O2

N2

CO2

0.122

0.110

0.176

26.2

25.5

25.0

• equal volumes of different gases contain the same number of molecules.

• molar volumes for all ideal gases are identical at a given T, P.

• V/n = 22.414 L/mol @ STP (0oC, 1 atm)

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