Mole-Mass-Volume Relationships of Gases

TABLE 12.3 Mass of a Molar Volume (22.4 L) of Various Gases 

The molar volume is useful for determining the molar mass of a gas or of substances that can be easily vaporized. If the mass and the volume of a gas at STP are known, we can calculate its molar mass. For example, 1.00 L of pure oxygen at STP has a mass of 1.429 g. The molar mass of oi gen may be calculated ly multiplying the mass of 1.00 L by 22.4 L/mol  

If the mass and volume are at other than standard conditions, we change the volume to STP and then calculate the molar mass. 

The molar volume, 22.4 L/mol, is used as a conversion factor to convert grams per liter to grams per mole (molar mass) and also to convert liters to moles. The two conversion factors are 

Standard conditions appiy oniy to pressure, temperature, and voiume. iMass is not affected. 

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