Q.

The vapour pressure of hexane (C6H14) and heptane (C7H16) at 50oC are 408 Torr and 141 Torr, respectively. The composition of the vapour above a binary solution composition containing a mole fraction of 0.300 hexane is (Y6=mol fraction of hexane and Y7=mol fraction of heptane).

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a

Y6=0.8,Y7=0.2

b

Y6=0.554,Y7=0.446

c

Y6=0.300,Y7=0.700

d

Y6=0.871,Y7=0.129

answer is B.

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Detailed Solution

Y6=P6oX6PT=408×0.3PT...(1)Y7=P7oX7PT=141×0.7PT...(2)Dividing equation (1) by (2), we get Y6Y7=1.24 & Y6+Y7=1∴Y7=0.446 & Y6=0.554

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