JEE Advanced 2011 Chemistry question
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 °C) are introduced. Considering the ideal gas behaviour, the total volume (in litre) of the gases at 0 °C is close to
Answer: 7
Solution
The piston is free, so the total pressure inside is 1 atm. The unknown compound cannot exert more than its vapour pressure; assuming that liquid and vapour coexist (verified below), its partial pressure is 0.68 atm. Then the partial pressure of helium is atm. Volume of the
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