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The an evacuated vessel with movable pis...

The an evacuated vessel with movable piston under external pressure of 1 atm, 0.1 mol of He and 1.0 mol 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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The correct Answer is:
7
For an ideal gas, `PV = nRT`
`3He = 0.1, P = 1 atm - 0.68 = 0.32`
`:. 0.32 xx V = 0.7 xx 0.0821 xx 273`
`:. V = 9`
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