CHM 131 Exam-I-2005

CHM 131 Exam-I-2005 - Chemistry 131-Krugh Professor Thomas...

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Chemistry 131-Krugh Exam I September 29, 2005 Professor Thomas R. Krugh Name __________________________________ _______________________________ (please print) (signature) UR ID. No. ____________________________ There are SIX questions on this exam. Please check to be sure you have a complete exam package. Please work exam problems on the pages provided. Show all your work neatly and circle your answers; credit is awarded for the work shown. If you need additional space to complete a problem, please tell us where to look for your solution. Question 1. (25 points) _____________ Question 2. (25 points) _____________ Question 3. (25 points) _____________ Question 4. (20 points) _____________ Question 5. (20 points) _____________ Question 6. (25 points) _____________ Bonus: My Recitation TA's name is: ____________ ______________ (2 points) _______________ (first name) (last name) Exam Total (140 points) _____________ The last page of the exam has a periodic table. Reference Data: H 1.008 S 32.07 One liter is 1000 mL He 4.00 P 30.97 One pound is 453.6 grams C 12.01 Cl 35.45 One pound is 16 ounces. N 14.01 K 39.10 One ton is 2000 lbs. O 16.00 Cu 63.55 Magnesium is in Group II Na 22.99 Mg 24.31 One mole of gas at STP = 22.4 L Ag 107.9 π 3.141592 Air is 19.8% oxygen
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Chemistry 131-Krugh Exam I Name: _________________________________ Page 2 of 9 Points on this page __________ 1a. (10 points) Naturally occurring copper is 69.17 percent 63 Cu, which has an atomic mass of 62.929 amu, and 30.83 percent 65 Cu, which has an atomic mass of 64.928 amu. Calculate the isotopically averaged atomic mass of copper. 1b. (15 points) A compound is composed of 41.39% C, 3.47% H, and 55.14% O. If 0.129 mol of this compound has a mass of 15.0 g, what are the empirical and molecular formulas of the compound?
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CHM 131 Exam-I-2005 - Chemistry 131-Krugh Professor Thomas...

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