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?

Explanation

Molecular mass of oxygen=32
Vapours density of oxygen `=(32)/(2)=16`
Thus, vapour density of the gaseous element`=16xx5=80`
Molecular mass of the gaseous element `=80xx2=160`
As the molecule is triatomic, its atomic mass `=("Mol.mass")/("Atomicity")`
`=(160)/(3)=53.33`