Find the mole fraction of the solute if the vapour pressure of a dilute aqueous solution of glucose is 720 mm of Hg at 373 K. (Vapour pressure of water at 373 K is 760 mm).
Answer & explanation
Correct answer: option 3
\(\frac{P^o - P_s}{P^o}\) = Mole fraction of solute
Po = vapour pressure of water at 373 K is 760 mm
\(\frac{760 - 720}{760}\) = Mole fraction of solute
Mole fraction of solute = \(\frac{40}{760}\) = \(\frac{1}{19}\)