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Firstly, we will find the no. of moles of the given compounds.
No. of moles of benzene :
and the no. of moles of toluene :
Now we will find mol fraction of both:-
Mole fraction of benzene :-
and mole fraction of toluene :
Now,
Ptotal = Pb + Pt
or
or
Hence mole fraction of benzene in vapour phase is given by :