1197600944Xuj - Gu, Phillip Final 1 Due: Dec 10 2007, 2:00...

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Unformatted text preview: Gu, Phillip Final 1 Due: Dec 10 2007, 2:00 am Inst: Brodbelt 1 This print-out should have 40 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. Brodbelt CH301 Final Exam Fall 2007 Use of programmable calculators or cell phones or IPODS is considered cheating and is prohibited. You may not leave the room for any reason. You may not start the exam after 2:15 pm. GOOD LUCK! 001 (part 1 of 1) 10 points An orbital has a principal quantum number of 3. The magnetic quantum number is- 1. What is the shape of the orbital? 1. p , d , or f 2. s or p 3. s , p , or d 4. f 5. d 6. p 7. d or f 8. p or d correct 9. s Explanation: For a value of n = 3, the subsidiary quan- tum number could have a value of 0, 1, or 2. However, the magnetic quantum number has a value of- 2, so could not be 0 nor 1; it must be 2, which corresponds to the d-orbitals. 002 (part 1 of 1) 10 points What is the combined number of electrons in p orbitals in the n = 1, n = 2, and n = 3 shells? 1. 2 2. 28 3. 12 correct 4. 6 5. 18 Explanation: The only p subshells that exist in the n = 1, n = 2, and n = 3 shells are 2 p and 3 p . Each p subshell holds 6 electrons, for a total of 12. 003 (part 1 of 1) 10 points Which of the following inequalities concern- ing the absolute entropy per mole at 25 C is INCORRECT? 1. S (NaCl(s)) > S (NaCl(aq)) correct 2. S (Na(g)) > S (Na(s)) 3. S (H 2 O(g)) > S (H 2 O( )) 4. S (CHCl 3 (g)) > S (CHCl 3 ( )) 5. S (H 2 O( )) > S (H 2 O(s)) Explanation: Of the states of matter, solids are the most ordered and gases are the least ordered. The entropy of any substance increases as the sub- stance goes from solid to liquid to gas. Solu- tions are also inherently more disordered than pure substances. Thus the correct choice is S (NaCl(s)) > S (NaCl(aq)), because by dis- solving the NaCl, it becomes more disordered; i.e. , higher in entropy. 004 (part 1 of 1) 10 points SO 3 has how many regions of high electron density and how many bonded electrons when the octet rule is strictly obeyed? 1. 4; 8 2. 3; 8 correct Gu, Phillip Final 1 Due: Dec 10 2007, 2:00 am Inst: Brodbelt 2 3. 4; 6 4. 4; 5 5. 4; 14 6. 3; 10 7. 3; 6 8. 5; 14 9. 5; 6 Explanation: One of the three resonant structures is S O O O 005 (part 1 of 1) 10 points The enthalpy of fusion of methanol (CH 3 OH) is 3.16 kJ/mol. How much heat would be absorbed or released upon freezing 25.6 grams of methanol? 1. 0.253 kJ released 2. 0.253 kJ absorbed 3. 2.52 kJ released correct 4. 3.95 kJ released 5. 3.95 kJ absorbed 6. 2.52 kJ absorbed Explanation: n CO 2 = 8.0 mol At STP we can use the standard molar volume, 22 . 4 L mol : ? L = 8 . 0 mol 22 . 4 L mol = 179 L 006 (part 1 of 1) 10 points What mass of CH 4 is required to produce 14.5 g of H 2 O if the reaction has a 73.5% yield?...
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This note was uploaded on 03/19/2009 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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1197600944Xuj - Gu, Phillip Final 1 Due: Dec 10 2007, 2:00...

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