Chem2 hw1 - Yoon Seong Meen – Homework 1 – Due 11:00 am...

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Unformatted text preview: Yoon, Seong Meen – Homework 1 – Due: Sep 11 2007, 11:00 am – Inst: James Holcombe 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points The vapor pressure of CH 3 COCH 3 (propa- none or acetone), is 67 Torr at 0 ◦ C and 222 Torr at 25 ◦ C. What is the normal boil- ing point of propanone? The universal gas constant is 8 . 314 J K · mol . Answer in units of ◦ C. 002 (part 1 of 1) 10 points Arsine (AsH 3 ) is a highly toxic compound used in the electronic industry for the pro- duction of semiconductor. Its vapor pressure is 35 Torr at- 111 . 95 ◦ C and 253 Torr at- 83 . 6 ◦ C. What is the standard enthalpy of vaporization of arsine? Answer in units of kJ / mol. 003 (part 1 of 1) 10 points The vapor pressure of CH 3 COCH 3 (propa- none or acetone), is 67 Torr at 0 ◦ C and 222 Torr at 25 ◦ C. What is the standard en- tropy of vaporization of propanone? Answer in units of J K · mol . 004 (part 1 of 1) 10 points The vapor pressure of hydrogen azide (HN 3 ) is 58 Torr at- 22 . 75 ◦ C and 512 Torr at 25 ◦ C. What is the standard free energy of vaporiza- tion of hydrogen azide? Answer in units of ◦ C. 005 (part 1 of 1) 10 points Methane (CH 4 ) forms a molecular solid. What type of forces hold it in a solid con- figuration? I) London forces II) dipole-dipole forces III) hydrogen bonding 1. I only 2. II only 3. I, II, and III 4. I and II only 5. III only 6. II and III only 006 (part 1 of 1) 10 points Which one of the following statements is NOT applicable to molecular solids? 1. Molecular solids have relatively low melt- ing points. 2. Molecular solids are usually excellent con- ductors of electric current. 3. Molecular solids are soft compared to covalent solids. 007 (part 1 of 1) 10 points When a gas expands into a vacuum, w = 0. 1. True 2. False 008 (part 1 of 1) 10 points Consider the following classic: Humpty Dumpty sat on a wall... Humpty Dumpty had a great fall... All the king’s horses and all the king’s men Couldn’t put Humpty back together again....
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Chem2 hw1 - Yoon Seong Meen – Homework 1 – Due 11:00 am...

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