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

`"Density, d"=(Mp)/(RT)`
At the same temperature and for the same density.
`{:(" "M_(1)p_(1)=M_(2)p_(2)),("(Gaseous oxide) "(N_(2))),(" "M_(1)xx"(2 bar)"=28xx"(5 bar)"):}`
`M_(1)=(28xx5)/(2)=70u`