Question

(a) The vapour pressure of n-hexane and n-heptane at $273K$ are $45.5mmHg$ and $11.4mmHg$, respectively.What is the composition of a solution of these two liquids if its vapour pressure at $273K$ is $37.3mmHg$.
(b) The mole fraction of n-hexane in the vapour above a solution of n-hexane and n-heptane is $0.75$ at $273K$.
What is the composition of the liquid solution?

• A. $\left(a\right)0.76,0.24,\left(b\right)0.61$
• B. $\left(a\right)0.67,0.33,\left(b\right)0.57$
• C. $\left(a\right)0.59,0.41,\left(b\right)0.67$
• D. None of these

Answer 1

Answer: (A)

$\left(a\right)0.76,0.24,\left(b\right)0.61$