States of Matter - Result Question 66

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

(2011)

Subjective Questions

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Answer:

Correct Answer: 66. (7L)

Solution:

  1. Since, the external pressure is 1.0atm, the gas pressure is also 1.0atm as piston is movable. Out of this 1.0atm partial pressure due to unknown compound is 0.68atm.

Therefore, partial pressure of He

=1.000.68=0.32atm.  Volume =n(He)RTp(He)=0.1×0.082×2730.32=7L

Volume of container = Volume of He.



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