A 48.4-g sample of glucose (a nondissociated, nonvolatile solute with the formula C₆H₁₂O₆) is dissolved in 151.2 g of water. What is the vapor pressure of this solution at 100°C? A) 736 torr B) 576 torr C) 23.6 torr D) 760 torr E) 184 torr

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Quizplus · Accepted Answer

The vapor pressure of the solution can be calculated using Raoult's law, which states that the vapor pressure of a solution is directly proportional to the mole fraction of the solvent. Since glucose does not dissociate or volatilize, it will not contribute to the vapor pressure directly. The vapor pressure of pure water at 100°C is 760 torr. The mole fraction of water in the solution can be calculated and used to find the vapor pressure of the solution, which will be slightly less than 760 torr due to the presence of glucose. Choice A, 736 torr, is the only option slightly less than 760 torr, indicating it accounts for the presence of glucose reducing the vapor pressure of water.

A 484-G Sample of Glucose (A Nondissociated, Nonvolatile Solute with the the Formula