Question 21

To 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 $$0^\circ C$$) are introduced. Considering the ideal gas behaviour, the total volume (in litre) of the gases at 0ºC is close to.

Correct Answer: 7

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