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Question

The density of a gaseous element is 5 times that of oxygen under similar conditions. If the molecule of the element is triatomic, what will be its atomic mass ?

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Solution

Molecular mass of oxygen = 32
Vapour density of oxygen =322=16
Thus, vapour density of the gaseous element =16×5=80
Molecular mass of the gaseous element =80×2=160
As the molecule is triatomic, its atomic mass =Mol.massAtomicity
=1603=53.33

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