The vapour pressure of pure benzene and toluene are 160 and 60 ~mm Hg respectively. The mole fraction of benzene in vapour phase in contact with equimolar solution of benzene and toluene is

Step-by-step solution

For equimolar solution, aligned & _b= _t=0.5 & p _b= _b p _b^0=0.5 160 & =80 ~mm & p _b= _t p _b^0=0.5 60 & =30 ~mm aligned p _ total =80+30=110 ~mm Mole fraction of benzene in vapour phase = p _b p _ total = 80 110 =0.727=0.73