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

This preview shows pages 1–2. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

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 −...
View Full Document

## 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.

### Page1 / 4

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online