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Q.

Liquids A and B form an ideal solution. The vapour pressures of A and B are 50 and 32 mmHg respectively at 300 K. One mole of liquid A is mixed with 1 mole of liquid B. What is the approximate mole fraction of A in vapour phase?

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a

0.50

b

0.25

c

0.39

d

0.61

answer is D.

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