Answer :


of benzene = 50.71 mm Hg

of naphthalene = 32.06 mm Hg

Using the formula of lowering vapour pressure to calculate mole fraction of benzene and naphthalene in solution,


Using formula for vapour pressure,

Mole fraction of benzene in vapour phase is calculated by,

Thus, mole fraction of benzene in vapour phase is 0.6744

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