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To an evacuated vessel with movable pist...

To an evacuated vessel with movable piston under external pressure of 1 atm 0.1 mole of He and 1.0 mole of an unknown compound vapour pressure 0.68 atm at `0^(@)C` are introduced Considering the ideal gas behaviour the total volume (in litre) of the gases at `0^(@)C` is close to .

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Vapour pressure due to the compound `=0.68 atm`
`P_(He)=1-0.68=0.32 atm`
`implies P_(He)xxV=n_(He)xxRxxT`
`implies V=(0.1xx0.0321xx273)/(0.32)=7.004~~7`
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