Molar Mass and Gas Densities

Molar Mass and Gas Densities - d of a gas can be determined...

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Molar Mass and Gas Densities Density Has the units of mass per unit volume (n/V) has the units of moles/liter . If we know the molecular mass of the gas, we can convert this into grams/liter (mass/volume). The molar mass ( M ) is the number of grams in one mole of a substance. If we multiply both sides of the above equation by the molar mass: The left hand side is now the number of grams per unit volume, or the mass per unit volume (which is the density ) Thus, the density (
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Unformatted text preview: d ) of a gas can be determined according to the following: • Alternatively, if the density of the gas is known, the molar mass of a gas can be determined: Example: What is the density of carbon tetrachloride vapor at 714 torr and 125°C? The molar mass of CCl 4 is 12.0 + (4*35.5) = 154 g/mol. 125°C in degrees Kelvin would be (273+125) = 398K. Since we are dealing with torr, the value of the gas constant, R, would be 62.36 L torr/mol K....
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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