A solution containing ethylene glycol and water has a vapor pressure of 7.88 torr at 10∘C. Pure water has a vapor pressure of 9.21 torr at 10∘C. What is the mol

Question

12. Calculating the Vapor Pressure of a Solution Containing a Nonvolatile Nonelectrolyte Solute

Answer 1

∆P_solvent = (X_solute)(Pº_solvent)

∆P_solvent = change in vapor pressure = 9.21 torr - 7.88 torr = 1.33 torr

X_solute = mole fraction of the solute = ?

Pº_solvent = vapor pressure of the pure solvent = 9.21 torr

 

1.33 torr = (X_solute)(9.21)

X_solute = 1.33 torr/9.21 torr)

X_solute = 0.144