Chemistry 1A - Fall 2002 - Midterm 3

Chemistry 1A - Fall 2002 - Midterm 3 - Chemistry 1A, Fall...

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Chemistry 1A, Fall 2002 Midterm Exam III, Version A November 12, 2002 (90 min, closed book) Name: TA: SID: Section: Please read this first: Write your name and that of your TA on all 9 pages; On the Scantron TM , bubble in Form A. Test-taking Strategy This test consists of two parts: multiple choice ( answers to be circled and entered on the Scantron TM sheet ) and short answer. In order to maximize your score on the exam: Do the questions you know how to do first. Then, go back and spend more time on the questions you find more challenging. Budget your time carefully -- don't spend too much time on one problem. Show all work for which you want credit and don't forget to include units. Page Score MC 7 8 9 Total
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Potentially Useful Information Compound D H f o (kJ/mol) HCl -92.31 HBr -36.40 HI +26.48 H 2 O (g) -241.82 H 2 O (l) -285.83 Br 2 (g) +30.91 I (g) +62.44 CO 2 -393.51 methane -74.81 ethane -84.68 propane -103.85 butane -126.15 pentane -146.44 Bond Energies, kJ/mol H-H 436 C-Cl 338 Cl-Cl 242 C-H 412 H-Cl 431 C-C 348 C-O 360 O-H 463 O=O 498 C=O 743 C=C 612 PV = nRT RT E kin 2 3 = M 3RT v rms = E = q + w w = - P ext V T nR E = 2 3 G ° = H ° - T S ° H ° Σ H ° f (products) - Σ H ° f (reactants) R = 8.314 J / (K . mol) N A = 6.022 x 10 23 1 cal = 4.18 J 101.3 J = 1 L·atm R = 0.08206 (atm·L) / (mol·K) = 8.314 J/(mol·K) k B = 1.381 x 10 -23 J / K h = 6.626 x 10 -34 J s c = 3.0 x 10 8 m . s -1 1 nm = 10 -9 m 1 kJ = 1000 J 1 Torr = 1 mmHg 1 atm = 760 mmHg J = (kg·m 2 )/s 2 PbS (s) + 3 / 2 O (g) PbO (s) + SO (g) H = - 413.7 kJ P 4 (s) + 6 Cl (g) 4 PCl 3 (l) H = + 106.8 kJ P 4 (s) + 5O2 P 4 O 10 (s) -2984.0 kJ PbO (s) + C (s) Pb (s) + CO (g) H = + 106.8 kJ P (s) 4 P (g) H = +1258.6 kJ P (s) + 6 Cl 2 (g) 4 PCl (g) H= -1148.0 kJ
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Part I Multiple Choice (4 pts each, 80 pts total) Bubble in the correct answer on your Scantron TM form AND circle your answer on the exam. There is only one correct answer for each question, so you should circle and fill in one and only one answer for each question. There is no penalty for an incorrect response. 1.) The reaction of magnesium with hydrochloric acid shown is carried out in an Erlenmeyer flask using the apparatus shown. The products are collected in the inverted round bottom flask as they bubble through water in the collection tray. If 456 ml of gas is collected at 742 mmHg and 22.0 o C, what is the total number of moles of H 2 produced? (The vapor pressure of water at 22.0 o C is 19.8 torr) Mg(s) + 2HCl(aq) MgCl 2 (aq) + H 2 (aq) A) 0.0184 C) 0.0034 D) 0.148 E) 0.040
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This note was uploaded on 04/01/2008 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at University of California, Berkeley.

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Chemistry 1A - Fall 2002 - Midterm 3 - Chemistry 1A, Fall...

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