If vapour pressure of pure solvent and solution are 240 and 216 mm Hg respectively then mole fraction of solvent in solution is

Step-by-step solution

aligned & P ₁=216 ~mm Hg . P ₁^0=240 ~mm Hg & P = P ₁^0- P ₁=240-216=24 ~mm Hg & Now, P P ₁^0 = x ₂ & x ₂= 24 mmHg 240 mmHg -0.1 aligned Hence, mole fraction of solvent, x ₁=1- x ₂=1-0.1=0.9