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At 55.0 °C, what is the vapor pressure of a solution prepared by dissolving 75.8 g of LiF in 253 g of water? The vapor pressure of water at 55.0 °C is 118 mmHg. Assume complete dissociation of the solute.

At 55.0 °C, what is the vapor pressure of a solution prepared by dissolving 75.8 g of LiF in 253 g of water? The vapor pressure of water at 55.0 °C is 118 mmHg. Assume complete dissociation of the solute.

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter12: Solutions
Section: Chapter Questions
Problem 12.88QE
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As solute is dissolved in a solvent, the vapor pressure of the solution changes according to Raoult's law Psoln Psolv X Xsolv where Psoln is the vapor pressure of the solution, Psolv is the vapor pressure of the pure solvent, and Xsolv is the mole fraction of the solvent. If the solute dissociates into ions, the term Xsolv must be modified to take into consideration the total number of moles of particles in the solution, both ions and molecules. When a solution contains two volatile components, A and B, the total pressure of the solution is equal to the sum of the individual vapor pressures according to Dalton's law as follows: Ptotal PAX XA +PB X XB Part A At 55.0 °C, what is the vapor pressure of a solution prepared by dissolving 75.8 g of LiF in 253 g of water? The vapor pressure of water at 55.0 °C is 118 mmHg. Assume complete dissociation of the solute. Express your answer to three significant figures and include the appropriate units. ► View Available Hint(s) μA Value Submit Units ?
Transcribed Image Text:As solute is dissolved in a solvent, the vapor pressure of the solution changes according to Raoult's law Psoln Psolv X Xsolv where Psoln is the vapor pressure of the solution, Psolv is the vapor pressure of the pure solvent, and Xsolv is the mole fraction of the solvent. If the solute dissociates into ions, the term Xsolv must be modified to take into consideration the total number of moles of particles in the solution, both ions and molecules. When a solution contains two volatile components, A and B, the total pressure of the solution is equal to the sum of the individual vapor pressures according to Dalton's law as follows: Ptotal PAX XA +PB X XB Part A At 55.0 °C, what is the vapor pressure of a solution prepared by dissolving 75.8 g of LiF in 253 g of water? The vapor pressure of water at 55.0 °C is 118 mmHg. Assume complete dissociation of the solute. Express your answer to three significant figures and include the appropriate units. ► View Available Hint(s) μA Value Submit Units ?
Part B The solvent for an organic reaction is prepared by mixing 50.0 mL of acetone (C3H6O) with 48.0 mL of ethyl acetate (C4H8O2). This mixture is stored at 25.0 °C. The vapor pressure and the densities for the two pure components at 25.0 °C are given in the following table. What is the vapor pressure of the stored mixture? Psoln = μA Compound Value acetone Express your answer to three significant figures and include the appropriate units. View Available Hint(s) ethyl acetate Vapor pressure Density (mmHg) (g/mL) 230.0 0.791 95.38 0.900 Units ?
Transcribed Image Text:Part B The solvent for an organic reaction is prepared by mixing 50.0 mL of acetone (C3H6O) with 48.0 mL of ethyl acetate (C4H8O2). This mixture is stored at 25.0 °C. The vapor pressure and the densities for the two pure components at 25.0 °C are given in the following table. What is the vapor pressure of the stored mixture? Psoln = μA Compound Value acetone Express your answer to three significant figures and include the appropriate units. View Available Hint(s) ethyl acetate Vapor pressure Density (mmHg) (g/mL) 230.0 0.791 95.38 0.900 Units ?
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