1.

If two substances A and B have p_(A)^(@),P_(B)^(@)=1:2 and have mole fraction in solution 1:2, then mole fraction of A in vapours is

Answer»

0.33
0.25
0.52
0.2

SOLUTION :`{:("In solution, if ", x_(A)x",",x_(B)=2x),("and if",p_(A)^(@)=p",",p_(B)^(@)=2p),(THEREFORE,p_(A)=x xxp",",p_(B)=2x XX 2p=4x xxp),(therefore, p_("TOTAL")=5 x p.,):}`
Mole FRACTION in vapour phase
`(y_(A))=(p_(A))/(P_("total"))=(xp)/(5xp)=(1)/(5)=0.2`


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