Q.

An ideal solution was found to have a vapour pressure of 80 torr when the mole fraction of a non-volatile solute was 0.2. What would be the vapour pressure of the pure solvent at the same temperature?

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a

64 torr

b

80 torr

c

100 torr

d

400 torr

answer is C.

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Detailed Solution

80=P∘(0.8)⇒P∘=100 torr.
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