To an evacuated vessel with movable piston under external pressure of 1.0 atm at O0C , 0.1 mole of Helium and 1.0 moles of an unknown compound ( vapour pressure is 0.68 atm at O0C ) are introduced . Then which of the following properties are correct ?

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Total pressure of the vessel is 0.68 atm

Total volume of the gasses at O0C is 7L

Number moles of the compound is 0.5

Total number of moles of the gases is 2

answer is B.

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Detailed Solution

PHe =Ptotal−0.68 =0.38 atmV=NHe×R×TPHe=0.1×0.0821×2730.32 =7L

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