1. Tardigrade
  2. Question
  3. Chemistry
  4. Liquid A and B form ideal solution for all compositions of A and B at 25° C. Two such solutions with 0.25 and 0.50 mole fractions of A have the total vapour pressures of 0.3 and 0.4 bar, respectively. What is the vapour pressure of pure liquid B in bar?

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Liquid $A$ and $B$ form ideal solution for all compositions of $A$ and $B$ at $25^{\circ} C$. Two such solutions with $0.25$ and $0.50$ mole fractions of $A$ have the total vapour pressures of $0.3$ and $0.4$ bar, respectively. What is the vapour pressure of pure liquid $B$ in bar?

JEE AdvancedJEE Advanced 2020

Solution:

$0.3=p_{A}^{0} \times 0.25+p_{B}^{0} \times 0.75 $ .... (1)
$0.4=p_{A}^{0} \times 0.50+p_{B}^{0} \times 0.50$ .... (2)
On solving, $p _{ B }^{0}=0.20$ bar and $p _{ A }^{0}=0.6$ bar