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At 0^(@)C, the density of a certain oxid...

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

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Density of nitrogen, `rho=(Pm)/(RT)`
`P=5xx0.987 atm, m=28`
`:. rho=(5xx0.987xx28)/(0.0821xx273)`
Density of gaseous oxide
`(5xx0.987xx28)/(0.0821xx273)=(5xx0.987xx x)/(0.0821xx273)`
or `x=(5xx28)/2=70 g mol^(-1)`
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