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Vapor Pressure Lowering The vapor pressure of a pure solvent is REDUCED when a nonvolatile solute is added. This is summarized by Raoult's Law: Psolution ​=Xsolvent ​Psolvent ​ Where: Psolution is ​ is vapor pressure of the solution Xsolvent ​ is the mole fraction of the solvent in =(mol solvent )/(mol solvent + the solution mol solute) po solvent solvent is the vapo ​ As more solute particles are added, the mole fraction of the solvent goes down, and the vapor pressure is reduced.
The common laboratory solvent diethyl ether (ether) is often used to purify substances dissolved in it. The vapor pressure of diethyl ether , CH3​CH2​OCH2​CH3​, is 463.57 mmHg at 25∘C. In a laboratory experiment, students synthesized a new compound and found that when 17.35 grams of the compound were dissolved in 296.1 grams of diethyl ether, the vapor pressure of the solution was 457.96 mmHg. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight of this compound? (Diethyl ether =CH3​CH2​OCH2​CH3​=74.12 g/mol ) Molecular weight = g/mol