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Q.

Liquids A and B form ideal solution for all compositions of A and B at 25°C. Two such solutions with 0.25 and 0.50 mole fractions of A have the total vapor pressures of 0.3 and 0.4 bar, respectively. What is the vapor pressure of pure liquid B in bar?

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answer is 0.20.

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Detailed Solution

PT=PA0XA+PB0XB0.3=PA0×0.25+PB∞×0.75         . . . (1)0.4=PA∞×0.5+PB∘×0.50.8=PAo+PBo                           . . . . (2) on solving eq n (i) \& (ii) PA0=0.6, PBc=0.2
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