Answer the following questions using Figure 11.12:
- (a) What is the approximate equilibrium vapor pressure of water at 60 °C? Compare your answer with the data in Appendix G.
- (b) At what temperature does water have an equilibrium vapor pressure of 600 mm Hg?
- (c) Compare the equilibrium vapor pressures of water and ethanol at 70 °C. Which is higher?
Figure 11.12 Vapor pressure curves for diethyl ether [(C2H3)2O], ethanol (C2H5OH), and water. Each curve represents conditions of T and P of which the two phases, liquid and vapor, are in equilibrium. These compounds exist as liquids for temperatures and pressures to the left of the curve and as gases under conditions to the right of the curve. (See Appendix G for vapor pressures for water of various temperatures.)
Trending nowThis is a popular solution!
Chapter 11 Solutions
Chemistry & Chemical Reactivity
Additional Science Textbook Solutions
Chemistry: The Molecular Nature of Matter
Organic Chemistry
Chemistry: Atoms First
Introductory Chemistry (6th Edition)
Chemistry For Changing Times (14th Edition)
Elementary Principles of Chemical Processes, Binder Ready Version
- Are changes in state physical or chemical changes? Explain. What type of forces must be overcome to melt or vaporize a substance (are these forces intramolecular or intermolecular)? Define the molar heat of fusion and molar heat of vaporization. Why is the molar heat of vaporization of water so much larger than its molar heat of fusion? Why does the boiling point of a liquid vary with altitude?arrow_forwardMaple syrup sap is 3% sugar (sucrose) and 97% water bymass. Maple syrup is produced by heating the sap toevaporate a certain amount of the water. (a) Describe what happens to the composition and boilingpoint of the solution as evaporation takes place. (b) A rule of thumb among maple syrup producers is thatthe finished syrup should boil about 4 C higher than theoriginal sap being boiled. Explain the chemistry behindthis guideline. (c) If the finished product boils 4 C higher than the originalsap, calculate the concentration of sugar in the finalproduct. Assume that sugar is the only solute and theoperation is done at 1 atm pressure.arrow_forwardSelect the compound that will have the higher equilibrium vapor pressure based on predicted intermolecular forces. pentane (C5H12) iodine pentafluoridearrow_forward
- Diethyl ether has a ΔH(vap)° of 29.1 kJ/mol and a vapor pres-sure of 0.703 atm at 25.0° C. What is its vapor pressure at 95.0° C?arrow_forwardCalculate the vapor pressure (in atm) of pure water at 80.0°C. For water, ΔHvap = 40.7 kJ/mol, R = 8.314 J/K-molarrow_forwardJoin In, Question 1 When KCl dissolves in water, what types of intermolecular bonds are formed? KC1= potassium chloride Molar mass=74.5513 g/mol ion-ion ion-dipole hydrogen bonds ion-ion forces and H-bonds K² = positive charge C1 = negative charge ☐ Copyright ©2019 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.arrow_forward
- Diethyl ether has a ΔHvap of 29.1 kJ/mol and a vapor pressure of 0.703 atm at 25.0°C. What is its vapor pressure at 83.0°C?arrow_forwardAspirin has a higher molar mass compared to salicylic acid, however aspirin melts at a lower temperature than salicylic acid. Provide a brief explanation for this observation. Table 1 Compound: Formula: Salicylic Acid C;H6O3 Aspirin C9H3O4 Molar Mass: 138.12 Melting point: Ka 158-160°C 1.08 x 10³ 180.15 140-142°C 2.72 x 10$ pKa Solubility (g/100ML) 2.99 4.57 0.18 0.25arrow_forward60. Complete the following partial ICE tables. (b) 4NH3 (?) + 3O2(?)+⇌ 2N2 (?)+ 6H2O (?) Change ----------- +x ---------- -----------arrow_forward
- 2. The boiling point of methanol is 338 K. What is the vapor pressure of methanol at 250 K, given that AHwap = 35 kJ/mol?arrow_forwardThe vapor pressure of ethanol at 34.7 °C is 100.0 mm Hg, and ΔHvap = 38.6 kJ/mol. What is the temperature, in Kelvin, if the vapor pressure of ethanol is 386.0 mm Hg?arrow_forward1.) The vapor pressure of benzene, C6H6, is 40.1 mmHg at 7.60°C. What is the vapor pressure at 60.6°C if theΔHvap is 31.0 kJ/mol?arrow_forward
- Introductory Chemistry: A FoundationChemistryISBN:9781337399425Author:Steven S. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage LearningChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage Learning