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  4. The vapour pressure of benzene and toluene are 42mm and 36mm respectively. A solution contains benzene and toluene in the molar ratio of 1:2 . The mole fraction of benzene in vapour phase is:-

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Q. The vapour pressure of benzene and toluene are $42mm$ and $36mm$ respectively. A solution contains benzene and toluene in the molar ratio of $1:2$ . The mole fraction of benzene in vapour phase is:-

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Solution:

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