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 – find all choices before answering. VDBPhaseChangeThermoSigns001 001 10.0points 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 LDEGibbsEqn001 002 10.0points 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 Phasediag3c 003(part1of2)10.0points 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(part2of2)10.0points 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 Msci130911 005 10.0points 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 VaporPressureIMF01 006 10.0points 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. CH 4 <C 3 H 8 <CH 3 OH <C 3 H 7 OH 3. CH 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 VDBVaporPressureQualitative 007 10.0points 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 ChemPrin3eT0829 008 10.0points 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. ColligativePropertyConcepts01 009 10.0points Which of the following statements about col- ligative properties of solutions is FALSE?
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