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
Total volume of the gasses at O0C is 7L
c
Number moles of the compound is 0.5
d
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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