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Samidha M.D Grade: 12
        

whats 'vapour density' of a gas????

6 years ago

Answers : (2)

Prudhvi teja
83 Points
										

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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6 years ago
Srinivas Rao
11 Points
										

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.

6 years ago
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