The molar masses of helium and oxygen are 4.0 g/mol and 16 g/mol,respectively.At the same temperature and pressure,1 mole of helium will occupy

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According to Avogadro's law, equal volumes of gases at the same temperature and pressure contain an equal number of molecules. Therefore, 1 mole of helium will occupy the same volume as 1 mole of oxygen, regardless of their molar masses.

The Molar Masses of Helium and Oxygen Are 4