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

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.

Question

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
?

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