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Benzene and toluene form ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at 300 K are 50.71 mm Hg and 32.06 mm Hg respectively. Calculate the mole fraction of benzene in vapour phase if 80 g of benzene is mixed with 100 g of toluene.

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Molar mass of benzene Molar mass of toluene Now, no. of moles present in 80 g of benzene And, no. of moles present in 100 g of toluene ∴Mole fraction of benzene, xb And, mole fraction of toluene, It is given that vapour pressure of pure benzene, And, vapour pressure of pure toluene, Therefore,...
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Molar mass of benzene

Molar mass of toluene

Now, no. of moles present in 80 g of benzene

And, no. of moles present in 100 g of toluene

∴Mole fraction of benzene, xb

And, mole fraction of toluene,

It is given that vapour pressure of pure benzene,

And, vapour pressure of pure toluene,

Therefore, partial vapour pressure of benzene,

And, partial vapour pressure of toluene,

Hence, mole fraction of benzene in vapour phase is given by:

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