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Q.

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

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answer is 7.

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Detailed Solution

Since, the external pressure is 1 .0 atm, the gas pressure is also 1.0 atm as piston is movable. Out of this 1 atm partial pressure due to unknown compound is 0.68 atm.Therefore, partial pressure of He= 1.00 - 0.68 = 0.32 atm Volume =n(He)RTp(He)=0.1Ã0.082Ã273032=7L

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