problem_pdf - chang(ac35543 – HW 11 Chapter 9.2-9.8 –...

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Unformatted text preview: chang (ac35543) – HW 11 Chapter 9.2-9.8 – howard – (53135) 1 This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The enthalpy of combustion of benzoic acid (C 6 H 5 COOH) which is often used to calibrate calorimeters, is- 3227 kJ / mol. When 1 . 498 g of benzoic acid was burned in a calorimeter, the temperature increased by 2 . 122 ◦ C. What is the overall heat capacity of the calorime- ter? The overall heat capacity includes the calorimeter hardware and the water that is in it. Answer in units of kJ / ◦ C. 002 10.0 points Elemental sulfur exists in several forms, with rhombic sulfur the most stable under normal conditions and monoclinic sulfur slightly less stable. The standard enthalpies of combus- tion of the two forms (to sulfur dioxide) are- 296 . 83 kJ / mol and- 297 . 16 kJ / mol, respec- tively. Calculate the enthalpy of the rhombic → monoclinic transition. 1. 0.8 kJ 2. 0.7 kJ 3. . 33 kJ 4. 0.15 kJ 5. 0.10 kJ 6. 0.25 kJ 7. 0.23 kJ 8. 0.95 kJ 003 10.0 points How much heat is required to heat 0 . 1 g of ice at- 30 ◦ C to steam at 100 ◦ C? Use the ap- proximate values below for your calculation. c ice = 2 J / g · ◦ C c steam = 2 J / g · ◦ C c water = 4 J / g · ◦ C Δ H vap = 2 , 260 J / g Δ H fus = 340 J / g 1. 300 J 2. 193 J 3. 306 J 4. 187 J 5. 80 J 6. 74 J 004 10.0 points How much heat is required to vaporize 50.0 g of water if the initial temperature of the water is 25.0 ◦ C and the water is heated to its boiling point where it is converted to steam? The specific heat capacity of water is 4 . 18 J · ( ◦ C) − 1 · g −...
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This note was uploaded on 11/19/2009 for the course CH 53135 taught by Professor Howard during the Fall '09 term at University of Texas at Dallas, Richardson.

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problem_pdf - chang(ac35543 – HW 11 Chapter 9.2-9.8 –...

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