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whats 'vapour density' of a gas????
Dear samidha
Vapour 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.
vapour density = mass of n molecules of gas / mass of n molecules of hydrogen
(By definition, the molar mass of a gas is the ratio of the mass of one molecule of gas to that of an hydrogen atom under similar conditions.)
Therefore:
vapour density = molar mass of gas / molar mass of H2
vapour density = molar mass of gas / 2
vapour density = ½ × molar mass
(and thus: molar mass = 2 × vapour density)
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Regards,Askiitians ExpertsPrudhvi Teja
Now you can win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian
Vapour density is a relative scale of measurement that tells us how many times a given gas is heavier than Hydrogen, when all measurements are made at identical conditions.
So, vapour density = Mass of the given gas / Mass of the same volume of H2
As the Molecular weight of hydrogen is 2 amu,
V.D = Molecular Wt of the given gas / 2
2 x V.D = molecular wt of the given gas.
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