Consider the data in the table. Compound Melting point (°C) AHfus (kJ/mol) Boiling point (°C) AHyap (kJ/mol) HF -83.11 4.577 19.54 25.18 НСІ 1.991 -84.9 17.53 -114.3 HBr -86.96 2.406 -67.0 19.27 -35.38 HI -50.91 2.871 21.16 Using the data in the table, calculate A.Sfus and ASvap for HF. 24.08 J/(K mol) J/(K mol) 86.03 ASfus ASvap = Determine the entropy change when 2.50 mol HF(g) condenses at atmospheric pressure. AS J/K

Consider the data in the table. Compound Melting point (°C) AHfus (kJ/mol) Boiling point (°C) AHyap (kJ/mol) HF -83.11 4.577 19.54 25.18 НСІ 1.991 -84.9 17.53 -114.3 HBr -86.96 2.406 -67.0 19.27 -35.38 HI -50.91 2.871 21.16 Using the data in the table, calculate A.Sfus and ASvap for HF. 24.08 J/(K mol) J/(K mol) 86.03 ASfus ASvap = Determine the entropy change when 2.50 mol HF(g) condenses at atmospheric pressure. AS J/K

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

Chapter10: Liquids And Solids

Section: Chapter Questions

Problem 141CP: When I mole of benzene is vaporized at a constant pressure of 1.00 atm and at its boiling point of...

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Gallium metal has a melting point of 29.8°C. Use the information below to estimate the boiling point of gallium in °C. For a metal, gallium has a very low melting point. Substance Hf (kJ mol-1) Gf (kJ mol-1) S (J mol-1 K-1) Ga(s) 0 0 40.83 Ga( l ) 5.578 0.0888 59.25 Ga(g) 271.96 233.76 169.03
The phase diagram for water over a relative narrow pressure and temperature range is given in Figure 9.19. A phase diagram over a considerably wider range of temperature and pressure (kbar) is given nearby. This phase diagram illustrates the polymorphism of ice, the existence of a solid in more than one form. In this case, Roman numerals are used to designate each polymorphic form. For example, Ice I, ordinary ice, is the form that exists under ordinary pressures. The other forms exist only at higher pressures, in some cases extremely high pressure such as Ice VII and Ice VIII. Using the phase diagram, give the approximate P and T conditions at the triple point for Ice III, Ice V, and liquid water. Determine the approximate temperature and pressure for the triple point for Ices VI, VII, and VIII. What is anomalously different about the fusion curves for Ice VI and Ice VII compared to that of Ice I? What phases exist at 8 kbar and 20 °C? At a constant temperature of −10 °C, start at 3 kbar and increase the pressure to 7 kbar. Identify all the phase changes that occur sequentially as these conditions change. Explain why there is no triple point for the combination of Ice VII, Ice VIII, and liquid water.
Equilibrium vapor pressures of benzene, C6H6, at various temperatures are given in the table. (a) What is the normal boiling point of benzene? (b) Plot these data so that you have a graph resembling the one in Figure 11.12. At what temperature does the liquid have an equilibrium vapor pressure of 250 mm Hg? At what temperature is the vapor pressure 650 mm Hg? (c) Calculate the molar enthalpy of vaporization for benzene using the ClausiusClapeyron equation.
The following data are the equilibrium vapor pressure of limonene, C10H16, at various temperatures. (Limonene is used as a scent in commercial products.) (a) Plot these data as ln P versus 1/T so that you have a graph resembling the one in Figure 11.13. (b) At what temperature does the liquid have an equilibrium vapor pressure of 250 mm Hg? At what temperature is it 650 mm Hg? (c) What is the normal boiling point of limonene? (d) Calculate the molar enthalpy of vaporization for limonene using the Clausius-Clapeyron equation.
An amorphous solid can sometimes be converted to a crystalline solid by a process called annealing. Annealing consists of heating the substance to a temperature just below the melting point of the crystalline form and then cooling it slowly. Explain why this process helps produce a crystalline solid.
When I mole of benzene is vaporized at a constant pressure of 1.00 atm and at its boiling point of 353.0 K, 30.79 kJ of energy (heat) is absorbed and the volume change is +28.90 L. What are E and H for this process?