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 $ .
