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Q.

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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a

Total pressure of the vessel is 0.68  atm

b

Number moles of the compound is 0.5

c

Total number of moles of the gases is 2

d

Total volume of the gasses at O0C  is 7L

answer is B.

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Detailed Solution

PHe =Ptotal−0.68

=0.38  atm

V=NHe×R×TPHe=0.1×0.0821×2730.32

=7L

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