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Two liquids A (molar mass 80 g $mol^{−1}$) and B (molar mass 120 g $mol^{−1}$) form ideal solution over the entire range of composition. 60 g of A is mixed with 180 g of B. The vapour pressures of the liquids A and B are 70.5 mm Hg and 62.5 mm Hg respectively at 298 K. The respective mole fractions of the liquids A and B in the vapour phase are

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0.357 and 0.643
Hence (B) is the correct answer.
answered Jun 10, 2014 by sreemathi.v
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