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Question

Explain the relation between vapour density and molecular mass.


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Solution

Step 1: Vapour density (V.D.) = mass of ‘x’ volume of a gas / mass of equal volume of hydrogen

Step 2: Relative molecular mass is the ratio of the mass of one molecule of a substance to the 1/12th of mass of a carbon atom, or 1 amu.

Vapour density is the ratio of the mass of volume of a gas, to the mass of an equal volume of hydrogen, measured under the same conditions of temperature and pressure.

Molecular Mass = 2 ✕ Vapour Density

Therefore, Molecular Mass = 2 ✕ Vapour Density


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