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From Wikipedia, the free encyclopedia. Vapor density is the density of a vapour in relation to that of hydrogen. It may be defined as mass of a certain volume of a substance divided by mass of same volume of hydrogen. vapor density = mass of n molecules of gas / mass of n molecules of hydrogen. Therefore: vapour density = molar mass of gas / molar mass of H 2.
After the flask has been filled with carbon dioxide, it will be weighed, and the mass of the gas will be determined by subtracting the calculated mass of the truly empty flask. Density of Dry Air Density, g/L Temperature, Â°C P = 750 torr. P = 760 torr. P = 770 torr.