exams1288057388 - Chemistry 105 A Exam 3 First Letter of...

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1 Chemistry 105 A PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 3 Name: _______________________________________________ 03/30/10 Last 4 Digits of USC ID:____ ____ ____ ____ Lab TA’s Name: ___________________________ Lab: Tu 9 / Tu 1 / Tu 4 / W 1 / W 4 / F 1 Please circle lab section above . Question Points Score Grader 1 12 2 12 3 4 4 8 5 12 6 6 7 8 8 8 9 10 10 6 11 4 12 10 EXTRA 2 Total 100 Please Sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature: _______________________________________________________________ Instructions: 1. You must show work to receive credit. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. YOU MUST use black or blue ink. (No pencil, no whiteout, no erasable ink.) 4. There are 10 problems on 9 pages. Please count them before you begin. A periodic table and some useful equations can be found on the last page. 5. You MUST submit all pages to the proctors, including the periodic table page. Put your name onto the periodic table page in the space provided. 6. Only a Casio FX-260 calculator may be used on Chem 105a/b exams. 7. Turn off cell phones and other electronic devices and put them away, out of sight. They may not be taken out of your bag during the exam. 8. When time is called, stop working on your exam immediately, turn the exam over and pass it to the aisle. 9. Your exam will be returned to you in your next lab period. First Letter of Last Name KEY
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2 1. (12 pt) Using the following data, calculate the standard heat of formation of the compound ICl in kJ/mol. Show your work: H ° (kJ/mol) Cl 2 ( g ) 2Cl( g ) 242.3 I 2 ( g ) 2I( g ) 151.0 ICl(g) I(g) + Cl(g) 211.3 I 2 (s) I 2 (g) 62.8 ½ I 2 (s) ½ I 2 (g) 31.4 kJ/mol ½ I 2 ( g ) I( g ) 75.5 kJ/mol I(g) + Cl(g) ICl(g) -211.3 kJ/mol ½ Cl 2 ( g ) Cl( g ) 121.15 kJ/mol ½ I 2 ( s ) + ½ Cl 2 ( g ) ICl( g ) H f ° = +16.8 kJ/mol Normally, you don’t use fractions as coefficients, but by definition the standard heat of formation is the enthalpy change when
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