At `0^(@)C` the density of a gaseous oxide at 2 bar is same as that of nitrogen at 5 bar What is the molecular mass of the oxide ? .

Explanation

Using the expression, `d=(MP)/(RT)`, at the same temperature and for same density,
`underset(("Gaseous oxide"))M_(1)P_(1) " "= " " underset((N_(2))M_(2)P_(2)` (as R is constant)
`:. " " M_(1)xx2=28xx5 ("Molecular mass of "N_(2)=28 u)`
or `" " M_(1)=70 u`