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Question

Liquids A and B form an ideal solution in the entire composition range. At 350K, the vapor pressures of pure A and pure B are 7×103Pa and 12×103Pa, respectively. The composition of the vapor in equilibrium with a solution containing 40 mole percent of A at this temperature is:

A
xA=0.37,xB=0.63
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B
xA=0.28;xB=0.72
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C
xA=0.76;xB=0.24
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D
xA=0.4;xB=0.6
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Solution

The correct option is C xA=0.28;xB=0.72
yA=PAPTotal=PoAxAPoAxA×PoBxB
=7×103×0.47×103×0.4+12×103×0.6
=2.810=0.28
yB=0.72.

Hence, the correct option is B

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