finalexamsolns - Hou, Taylor Final 1 Due: Dec 10 2007, 2:00...

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Hou, Taylor – 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 – fnd all choices be±ore answering. The due time is Central time. Brodbelt CH301 Final Exam Fall 2007 Use o± programmable calculators or cell phones or IPODS is considered cheating and is prohibited. You may not leave the room ±or any reason. You may not start the exam a±ter 2:15 pm. GOOD LUCK! 001 (part 1 o± 1) 10 points What mass o± CH 4 is required to produce 14.5 g o± H 2 O i± the reaction has a 73.5% yield? CH 4 + 2O 2 CO 2 + 2H 2 O 1. 35.0 g 2. 6.46 g 3. 2.19 g 4. 4.73 g 5. 0.548 g 6. 18.9 g 7. 8.75 g correct Explanation: yield = 14 . 5 g % yield = 65% 14.5 g is the actual yield. We need to calculate the theoretical yield: 65 . 0 100 = 14 . 5 g CO 2 th . yield th . yield = 22 . 3 g CO 2 ? g O 2 = 22 . 3 g CO 2 × 1 mol CO 2 44 g CO 2 × 2 mol O 2 1 mol CO 2 × 32 g O 2 1 mol O 2 = 32 . 4 g O 2 002 (part 1 o± 1) 10 points Consider the compound peroxyacetylni- trate, an eye irritant in smog. O N C O O O O CH 3 Predict the indicated bond angle. 1. 60 2. 109.5 3. 120 correct 4. 30 5. 90 Explanation: There are 46 valence electrons; the struc- ture does not show lone pairs on the O atoms or the C - H bonds. There will be three lone pairs on the terminal O singly bonded to N, and two lone pairs on all other O atoms. 003 (part 1 o± 1) 10 points SO 3 has how many regions o± high electron density and how many bonded electrons when the octet rule is strictly obeyed? 1. 4; 5 2. 4; 6 3. 3; 6 4. 4; 8 5. 3; 10 6. 4; 14 7. 5; 14 8. 3; 8 correct
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Hou, Taylor – Final 1 – Due: Dec 10 2007, 2:00 am – Inst: Brodbelt 2 9. 5; 6 Explanation: One of the three resonant structures is S O O O 004 (part 1 of 1) 10 points Why is the heat of vaporization of water much larger than the heat of melting (fusion)? 1. Liquid water molecules are held close to- gether by hydrogen bonds, but solid water molecules (ice) are held close together by co- valent bonds. 2. The bonds holding liquid molecules to- gether are stronger than those holding to- gether solid water molecules (ice). 3. The statement is not true; the heat of melting is actually greater than the heat of vaporization. 4. Melting only requires a partial disruption of the hydrogen bonding network of water whereas vaporization requires complete disso- ciation of the hydrogen bonds. correct 5. Vaporization is a very exothermic process while melting is endothermic. Explanation: 005 (part 1 of 1) 10 points A 750.0 mL metal bulb is ±lled with 42.1 g of CH 4 and 3.23 g of NH 3 . If the amount of pressure contributed by CH 4 is 111.2 atm, then what is pressure due to NH 3 ? 1.
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finalexamsolns - Hou, Taylor Final 1 Due: Dec 10 2007, 2:00...

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