Solutions Question 44

Question: On adding solute to a solvent having vapour pressure 0.80 atm, vapour pressure reduces to 0.60 atm. Mole fraction of solute is [UPSEAT 2003]

Options:

A) 0.25

B) 0.75

C) 0.50

D) 0.33

Show Answer

Answer:

Correct Answer: A

Solution:

$ \frac{P^{o}-P_{s}}{P^{o}}=\frac{n}{n+N} $ ; $ P^{o}=0.80,P_{s}=0.60 $
$ \therefore \frac{n}{n+N}=\frac{0.2}{0.8}=0.25 $ .



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