1.

The partial pressure ratio P_(A)^(@):P_(B)^(@) for the two volatile liquid A and B and P_(A)^(@): P_(B)^(@)=1:2 and mole ratio is X_(A): X_(B)=1:2. What is the mole fraction of A ?

Answer»

<P>`0.33`
`0.25`
`0.20`
`0.52`

Solution :`p_(A)=X.p , p_(B)=x.p`
`p_(A)=x_(p),p_(B)=2x.2p`
Total pressure `p =p_(A)+p_(B)`
`p=xp+4xp=5xp`
`THEREFORE` Mole fraction of,
`A(X_(A))=(p_(A))/(p)=(xp)/(5xp)=(1)/(5)=0.2`


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