Give the Relationship between vapour density and relative molecular mass of a gas [formula only].

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Solution

Relationship between vapour density and relative molecular mass.
Vapour density is defined as the ratio by weight certain volume of vapour or gas at a certain temperature and pressure to the weight of the same weight of the same volume of $H_{2}$ at the same temperature and pressure.
Vapour density $= \frac{Molecular Mass}{2}$

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