試題詳解

17. The vapor pressure of a solution containing 92.3 g glycerin (C₃H₈O₃ m.w. = 92.09 g mol⁻¹) in 161.2 g ethanol (C₂H₅OH m.w. = 46.07 g mol⁻¹) is 117 torr at 40°C. Calculate the vapor pressure of pure ethanol at 40°C assuming that glycerin is a nonvolatile, nonelectrolyte solute in ethanol and the solution is an ideal solution.
(A) 139 torr
(B) 230 torr
(C) 452 torr
(D) 151 torr
(E) 525 torr