1. Boiling point of pure water at p= latm is 100.00°C. What is boiling point of the solution obtained by addition of 30 g of fructose (m.w. - 180 g mol') to 20 ml of water? 2. Consider a contain er of volume 40.0 dm' that is divided into two compartments of equal size. In the left compartment there is helium at 1.0 atm and 25 °C; in the right compartment there is argon at the same temperature and pressure p- 2atm. What are AG, A S and AH for the process occurring when the partition is removed. Assume that the gases are perfect. 3. How much (in g) of nitro gen is dissolved in 1 L of a water in a lake if a pressure of nitrogen above water is about 75 kPa. 4. Suppose that some mixture contains two substances A and B with n, - 0.2 ng and a small change in composition results in decrease of chemi cal potential of A, Ha, by 6 kJ mol. By how much will uB change? 5. What is the mo lar ratio of 1,1-dichloroethane (1I DCE) 1,2-dichloroethane (12DCE) in the gas phase above the solution containing 10 mol of 1,1-dichloroethane and 10 mol of 1,2-dichloroethane at 20° C. The vapor pressure of 1,1- dichloroethane is 24.0 kPa and the vapor pressure of 1,2-dichloro ethane is 8,0 kPa at 20° C. 6. The vapor pressure of pure dichloromethane at 298 K is 57.3 kPa. What is its vapor pressure above its mixture with chloroform with 8:2 molar ratios of dichloromethane to chloroform (consider their mixture an ideal solution). 7. Partial molar volumes of acetone and chloroform in their equimolar (0.5/0.5 molar fractions) mixture are 74.2 cm' mol- and 80.2 cm' mol. What is density of this solution? 8. Using the phase diagram for mixtures of cyclohexane and toluene, below estimate approximate molar fraction of benzene (in %) in A) vapor phases above a solution with 20% at its boiling point and B) of benzene at its boiling point and B) in liquid phase obtained upon heating the mixture originally with 40 % of benzene to 100 °C, Superheated vapour Dew point curve Subcooled liguid Bule point curve 0.0 02 Liquid/vapor Molefrac BENZENE
1. Boiling point of pure water at p= latm is 100.00°C. What is boiling point of the solution obtained by addition of 30 g of fructose (m.w. - 180 g mol') to 20 ml of water? 2. Consider a contain er of volume 40.0 dm' that is divided into two compartments of equal size. In the left compartment there is helium at 1.0 atm and 25 °C; in the right compartment there is argon at the same temperature and pressure p- 2atm. What are AG, A S and AH for the process occurring when the partition is removed. Assume that the gases are perfect. 3. How much (in g) of nitro gen is dissolved in 1 L of a water in a lake if a pressure of nitrogen above water is about 75 kPa. 4. Suppose that some mixture contains two substances A and B with n, - 0.2 ng and a small change in composition results in decrease of chemi cal potential of A, Ha, by 6 kJ mol. By how much will uB change? 5. What is the mo lar ratio of 1,1-dichloroethane (1I DCE) 1,2-dichloroethane (12DCE) in the gas phase above the solution containing 10 mol of 1,1-dichloroethane and 10 mol of 1,2-dichloroethane at 20° C. The vapor pressure of 1,1- dichloroethane is 24.0 kPa and the vapor pressure of 1,2-dichloro ethane is 8,0 kPa at 20° C. 6. The vapor pressure of pure dichloromethane at 298 K is 57.3 kPa. What is its vapor pressure above its mixture with chloroform with 8:2 molar ratios of dichloromethane to chloroform (consider their mixture an ideal solution). 7. Partial molar volumes of acetone and chloroform in their equimolar (0.5/0.5 molar fractions) mixture are 74.2 cm' mol- and 80.2 cm' mol. What is density of this solution? 8. Using the phase diagram for mixtures of cyclohexane and toluene, below estimate approximate molar fraction of benzene (in %) in A) vapor phases above a solution with 20% at its boiling point and B) of benzene at its boiling point and B) in liquid phase obtained upon heating the mixture originally with 40 % of benzene to 100 °C, Superheated vapour Dew point curve Subcooled liguid Bule point curve 0.0 02 Liquid/vapor Molefrac BENZENE
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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Transcribed Image Text:1. Boiling point of pure water at p= latm is 100.00°C. What is boiling point of the solution obtained by addition of 30
g of fructose (m.w. - 180 g mol') to 20 ml of water?
2. Consider a contain er of volume 40.0 dm' that is divided into two compartments of equal size. In the left compartment
there is helium at 1.0 atm and 25 °C; in the right compartment there is argon at the same temperature and pressure p-
2atm. What are AG, A S and AH for the process occurring when the partition is removed. Assume that the gases are
perfect.
3. How much (in g) of nitro gen is dissolved in 1 L of a water in a lake if a pressure of nitrogen above water is about 75 kPa.
4. Suppose that some mixture contains two substances A and B with n, - 0.2 ng and a small change in composition results
in decrease of chemi cal potential of A, Ha, by 6 kJ mol. By how much will uB change?
5. What is the mo lar ratio of 1,1-dichloroethane (1I DCE)
1,2-dichloroethane (12DCE) in the gas phase above the
solution containing 10 mol of 1,1-dichloroethane and 10 mol of 1,2-dichloroethane at 20° C. The vapor pressure of 1,1-
dichloroethane is 24.0 kPa and the vapor pressure of 1,2-dichloro ethane is 8,0 kPa at 20° C.
6. The vapor pressure of pure dichloromethane at 298 K is 57.3 kPa. What is its vapor pressure above its mixture with
chloroform with 8:2 molar ratios of dichloromethane to chloroform (consider their mixture an ideal solution).
7. Partial molar volumes of acetone and chloroform in their equimolar (0.5/0.5 molar fractions) mixture are 74.2 cm' mol-
and 80.2 cm' mol. What is density of this solution?
8.
Using the phase diagram for mixtures of cyclohexane and toluene, below estimate approximate molar
fraction of benzene (in %) in A) vapor phases above a solution with 20% at its boiling point and B) of
benzene at its boiling point and B) in liquid phase obtained upon heating the mixture originally with 40 %
of benzene to 100 °C,
Superheated vapour
Dew point curve
Subcooled liguid
Bule point curve
0.0
02
Liquid/vapor Molefrac BENZENE
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