Question

The vapour pressure of a dilute aqueous solution of glucose is 750 mm of Hg at 373 K. Calculate mole fraction of the solute :

• A. $0.013$
• B. $0.25$
• C. $0.968$
• D. $0.75$

Answer 1

The correct option is A $0.013$

$P^o=760;P_s=750mm$

We know

$\frac{P^o-P_s}{P^o}=x_2$

$\Rightarrow \frac{760-750}{760}=x_2$

$\Rightarrow x_2=0.013;x_1=1-0.013=0.968$