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To an evacuated vessel with movable piston under external pressure of 1 ~atm , 0.1 mole of He and 1.0 mole of an unknown compound (vapour pressure 0.68 mathrm ~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

Correct answer

7

Step-by-step solution

Since, the external pressure is 1.0 ~atm , the gas pressure is also 1.0 ~atm as piston is movable. Out of this 1.0 ~atm partial pressure due to unknown compound is 0.68 ~atm . Therefore, partial pressure of He =1.00-0.68=0.32 ~atm . aligned & Volume = n( He ) RT r( He ) = 0.1 0.082 273 0.32 =7 ~L & Volume of container = Volume of He . aligned

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