A) 0.25
B) 0.75
C) 0.50
D) Cannot be predicted
Correct Answer: A
Solution :
From Raoults law, \[\frac{P-{{P}_{s}}}{P}=\]mole fraction of solute \[({{x}_{A}})\] \[\therefore \] \[{{x}_{A}}=\frac{0.8-0.2}{0.8}\] \[=\frac{0.6}{0.8}=0.75\] Hence, mole-fraction of solvent \[=1-0.75=0.25\]
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