if value is not given then we can take any value of our choice as per the question like here for equal moles we did???
you cannot assume as you like
mole fractions are equal means ===>
mole fraction of benzene +mole fraction of toluene=1
mole fraction of benzene=mole fraction of toluene -----------given condition
2*mole fraction of benzene or 2*mole fraction of toluene=1
mole fraction of benzene or toluene=1/2=0.5
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