test1 - Version 001 Exam 1 vanden bout (51640) VDB Phase...

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Version 001 – Exam 1 – vanden bout – (51640) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. VDB Phase Change Thermo Signs 001 001 10.0 points Substance A has undergone a phase tran- sition (under constant pressure) where ΔH = 10kJ / mol and ΔS = 36J / K · mol. What phase transition could have occurred? 1. Freezing 2. melting 3. deposition 4. condensation LDE Gibbs Eqn 001 002 10.0 points Phosphine (the common name For PH3, a highly toxic gas used For Fumigation), has a Δ H vap = 14 . 6 kJ · mol 1 and a S vap = 78 . 83 J · mol 1 · K 1 . What is the normal boiling point oF phosphine expressed in centi- grade? 1. 273 C 2. 185 . 2 C 3. - 87 . 8 C 4. - 0 . 2 C Phase diag3c 003 (part 1 of 2) 10.0 points ReFer to the Following phase diagram For the next question also. - 100 0 100 200 300 A B C . 03 . 1 1 25 50 100 temperature ( C) pressure (atm) What is the normal boiling point oF this substance? 1. 200 C 2. 230 C 3. 100 C 4. 260 C 5. 0 C 6. 150 C 004 (part 2 of 2) 10.0 points What is the critical pressure For this sub- stance? 1. > 100 atm 2. 1 atm 3. 44 atm 4. 25 atm 5. 50 atm 6. 0.08 atm Msci 13 0911 005 10.0 points The vapor pressure oF benzene (C 6 H 6 ) is 120 torr at 27.0 C, and its normal boiling point is 80.1 C. What is the molar heat oF vaporiza- tion oF benzene?
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Version 001 – Exam 1 – vanden bout – (51640) 2 1. 4 . 95 × 10 4 J/mol 2. 4 . 56 × 10 3 J/mol 3. 3 . 07 × 10 4 J/mol 4. 2 . 49 × 10 2 J/mol 5. 1 . 31 × 10 3 J/mol Vapor Pressure IMF 01 006 10.0 points Rank these compound by vapor pressure from lowest to highest 1. CH 4 < CH 3 OH < C 3 H 8 < C 3 H 7 OH 2. 4 < C 3 H 8 < CH 3 OH < C 3 H 7 OH 3. 3 OH < C 3 H 7 OH < CH 4 < C 3 H 8 4. C 3 H 7 OH < C 3 H 8 < CH 3 OH < CH 4 5. C 3 H 7 OH < CH 3 OH < C 3 H 8 < CH 4 6. C 3 H 8 < CH 4 < C 3 H 7 OH < CH 3 OH VDB Vapor Pressure Qualitative 007 10.0 points The vapor pressure of a pure liquid depends on which of the following I. the volume of the liquid II. the volume of the gas III. the surface area of the liquid IV. the temperature 1. only I 2. only IV 3. only II 4. III and IV 5. all of them 6. I and II 7. only III ChemPrin3e T08 29 008 10.0 points Consider the phase diagram for sulfur be- low. 10 5 1300 368 424 Solid Rhombic Solid Monoclinic Liquid Gas Pressure, atm Temperature, K -→ At 424 K and 1300 atm, 1. only rhombic sulfur and sulfur gas exist in equilibrium. 2. only monoclinic sulfur is present. 3. rhombic sulfur, monoclinic sulfur, and liquid sulfur exist in equilibrium. 4. only rhombic sulfur is present. 5. rhombic sulfur, monoclinic sulfur, sulfur liquid, and sulfur gas exist in equilibrium. Colligative Property Concepts 01 009 10.0 points Which of the following statements about col- ligative properties of solutions is FALSE?
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This note was uploaded on 01/29/2012 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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test1 - Version 001 Exam 1 vanden bout (51640) VDB Phase...

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