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Physical Chemistry
2nd Edition
ISBN: 9781133958437
Author: Ball, David W. (david Warren), BAER, Tomas
Publisher: Wadsworth Cengage Learning,
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Chapter 6, Problem 6.35E
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1. The enthalpy of vaporization of methanol is 37.4 kJ/mol at
25°C. Molar heat capacities for liquid and gaseous methanol are
81.6 J/mol K and 43.9 J/mol·K respectively. Assume that heat
capacities are the constant in this temperature range. Calculate
the enthalpy of vaporization at
50 °C.
The boiling point of propane at 1 atm (14.7 psi) pressure is -42.0 °C and
its AH(vap) is 18.8 kJ/mol.
R = 8.314 ×10³ kJ/mol·K.
Calculate the pressure (in psi) of propane in a tank of liquid propane at
23.5 °C.
The 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?
Chapter 6 Solutions
Physical Chemistry
Ch. 6 - Prob. 6.1ECh. 6 - Prob. 6.2ECh. 6 - Prob. 6.3ECh. 6 - Prob. 6.4ECh. 6 - Prob. 6.5ECh. 6 - Prob. 6.6ECh. 6 - Prob. 6.7ECh. 6 - Prob. 6.8ECh. 6 - 6.9. Identify and explain the sign on in equation...Ch. 6 - 6.10. Use Hess’s law to prove that .
Ch. 6 - 6.11. Calculate the amount of heat necessary to...Ch. 6 - Prob. 6.12ECh. 6 - Assume that the vapH of an evaporating liquid...Ch. 6 - 6.14. As a follow-up to the previous exercise,...Ch. 6 - Prob. 6.15ECh. 6 - 6.16. What is for isothermal conversion of liquid...Ch. 6 -
6.17. Estimate the melting point of nickel, Ni,...Ch. 6 -
6.18. Estimate the boiling point of platinum, Pt,...Ch. 6 - Prob. 6.19ECh. 6 - Prob. 6.20ECh. 6 - 6.21. What assumption is used in the integration...Ch. 6 - Prob. 6.22ECh. 6 - Sulfur, in its cyclic molecular form having the...Ch. 6 - Prob. 6.24ECh. 6 - 6.25. Phosphorus exists as several allotropes that...Ch. 6 - Prob. 6.26ECh. 6 - 6.27. What is higher for a substance: its normal...Ch. 6 - 6.28. Elemental gallium is another substance whose...Ch. 6 - Prob. 6.29ECh. 6 - Consider the sulfur solid-state phase transition...Ch. 6 - 6.31. If it takes mega bars of pressure to change...Ch. 6 - Prob. 6.32ECh. 6 - Four alcohols have the formula C4H9OH: 1-butanol,...Ch. 6 - Prob. 6.34ECh. 6 - At 20.0C, the vapor pressure of ethanol is...Ch. 6 - Prob. 6.36ECh. 6 - Prob. 6.37ECh. 6 - Ethanol has a density of 0.789g/cm3 and a vapor...Ch. 6 - Prob. 6.39ECh. 6 - Prob. 6.40ECh. 6 - Prob. 6.41ECh. 6 - 6.42. At what pressure does the boiling point of...Ch. 6 - Prob. 6.43ECh. 6 - Prob. 6.44ECh. 6 - Prob. 6.45ECh. 6 - Prob. 6.46ECh. 6 - Prob. 6.47ECh. 6 - 6.48. Explain how glaciers, huge masses of solid...Ch. 6 - Prob. 6.49ECh. 6 - Prob. 6.50ECh. 6 - Prob. 6.51ECh. 6 - Prob. 6.52ECh. 6 - Prob. 6.53ECh. 6 - Prob. 6.54ECh. 6 - Prob. 6.55ECh. 6 - Prob. 6.56ECh. 6 - Prob. 6.57ECh. 6 - Use the phase diagram of water in Figure 6.6 and...Ch. 6 - Prob. 6.59ECh. 6 - Prob. 6.60ECh. 6 - At the triple point of a substance, the vapor...Ch. 6 - Prob. 6.62ECh. 6 - Prob. 6.63ECh. 6 - Prob. 6.64ECh. 6 - Prob. 6.65ECh. 6 - Prob. 6.66ECh. 6 - The phase diagram for elemental sulfur is shown in...Ch. 6 - Consider the phase diagram of sulfur in the...Ch. 6 - Prob. 6.69ECh. 6 - Rearrange the Clausius-Clapeyron equation,...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- 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_forwardFollow the step-wise process outlined in Problem 31 to calculate the amount of heat involved in condensing 100.00 g of benzene gas (C6H6) at 80.00C to liquid benzene at 25.00C. Use Tables 8.1 and 8.2 for the specific heat, boiling point, and heat of vaporization of benzene.arrow_forward9.46 The heat of fusion of pure silicon is 43.4 kJ/mol. How much energy would be needed to melt a 5.24-g sample of silicon at its melting point of 1693 K?arrow_forward
- The standard (1 bar) boiling point of acetone is 56.1 C, and its enthalpy of vaporization is 29.1 kJ/mol. Calculate the vapor pressure of acetone at 69.1 C.arrow_forwardA liquid has a ΔH°(vaporization) of 33.3 kJ/mol and a boiling point of 125°C at 1 atm. What is its vapor pressure at 109°C?arrow_forwardDetermine the normal boiling point of a liquid with vapor pressure 63.8 mmHg at 56.50°C, given that its molar heat of vaporization is 43.5 kJ/mol.arrow_forward
- Determine the vapor pressure (in mm Hg) of a substance at 29°C, whose normal boiling point is 76°C and has a ΔHvap of 38.7 kJ/mol.arrow_forwardA compound has a vapor pressure of 100 mmHg at 267 K and a normal boiling point of 338 K. What is the ΔHvap for this compound in kJ/mol?arrow_forwardThe standard molar enthalpy of vaporization of ammonia is 23.35 kJ/mol at its standard boiling point of -33.4°C. Calculate the pressure of the gas phase of ammonia in equilibrium with liquid ammonia +15.0°C. (We would call this the vapor pressure of ammonia at +15.0°C.)arrow_forward
- Calculate the pressure on top of Mt. Whitney (14,495 ft above sea level: the highest point in US excluding Alaska) where the boiling point of CH3CH2OCH2CH3 (diethyl ether) is 22.00° C. ΔHvap = 29.9 kJ/mole and the normal BP = 33.9° C. (Hint: what is the pressure at the normal boiling point?)arrow_forwardThe normal melting point of benzene is at 5.5°C, where its density changes from 0.891 g/mL to 0.879 g/mL when it transitions from solid to liquid. Its enthalpy of fusion is 10.59 kJ/mol. Estimate the melting point of benzene at 1000 atm. (1 L atm = 101.325 J)arrow_forward578,070 J of heat is required to raise the temperature of 15.0 moles of liquid methanol, CH3OH, from 25.0 °C to its boiling point (64.6 °C) and then to completely evaporate the methanol at that temperature. The specific heat of liquid methanol is 2.53 J g^-1 K ^-1 . Calculate the enthalpy of vaporisation of the compound.arrow_forward
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