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Atomic Number and Mass Number

The vapour pr...

Question

The vapour pressure of a solution having 0.9 mole fraction of ethanol in ethanol-water is:

A

42.88

mm

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B

36.0

mm Hg

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C

29.5

mm Hg

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D

28.8

mm Hg

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Solution

The correct option is A $42.88$ mm
The vapour pressure of a solution having a 0.9-mole fraction of ethanol in ethanol-water is 42.88 mm Hg.

Mole fraction of water =1 - 0.9 =0.1 mol

$P_{M} = P_{H_{2} O}^{0} \cdot X_{H_{2} O} + P_{e t h a n o l}^{0} \cdot X_{e t h a n o l}$

$= 32.8 \times 0.1 + 44 \times 0.9$

$= 3.28 + 39.6 = 42.88 m m H g$

Hence, the correct option is $A$

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