Question

The vapour pressure of water at room temperature
is 23.8 mm of Hg. The vapour pressure of an aqueous solution of sucrose with mole fraction 0.1 is equal to :

(1) 23.9 mm Hg
(2) 24.2 mm Hg
(3) 21.42 mm Hg
(4) 31.44 mm Hg

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Answer 1

ANSWER : C

Explanation:

P°-Ps/P° = Xsolute ( P° = vapour pressure of pure solvent , Ps = pressure of sucrose solution)

== 23.8-Ps/23.8 = 0.1

==23.8-Ps= 2.38

== Ps =21.42 mm of hg

== Ps=21.42mm of hg

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