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Determines the relation between molecular weight and vapour density.

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Molecular weight: It is the ratio of the weight of 1 molecule of a substance to the weight of one atom of hydrogen.

Mol.wt = mass of 1 molecule of a substance/mass of 1 mol. of hydrogen

Vapour Density : It is the ratio of the mass of a certain volume of gas or vapour of the mass of the same volume of hydrogen. 

Mol. wt. = 2 x vapour density

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