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Unformatted text preview: chauhan (mmc2762) – Jan 26 HW – sparks – (51150) 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Preview sections 12.12 and 12.13 before the next class. Many prerequisite topics covered on this assignment: molar mass, Avogadro’s number, and density! These homework as- signments are meant to make sure you have studied the course material before you come to the next class, so you will be prepared to build on these concepts. You will likely need more practice on some of the topics - check out the extra practice problems on the web. In fact, you should always look those over just to see the types of problems out there, since these problems and concepts can be ap- proached in many ways. 001 10.0 points Which has more molecules: a mole of CO 2 or a mole of H 2 ? 1. It depends on the pressure and tempera- ture. 2. They both have the same number of molecules. correct 3. a mole of CO 2 4. a mole of H 2 Explanation: 002 10.0 points 0.723 moles of ZnO 2 would weigh 1. 58.9 g. 2. 62.2 g. 3. 45.6 g. 4. 0.00742 g. 5. 70.4 g. correct 6. 135 g. Explanation: n ZnO 2 = 0.723 mol ? g = 0 . 723 mol ZnO 2 × 97 . 4 g 1 mol ZnO 2 = 70 . 4 g 003 10.0 points The total number of electrons in one mole of fluorine molecules (F 2 ) is 1. 18.99 × 6 . × 10 23 ....
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This note was uploaded on 04/03/2012 for the course CHEM 56920 taught by Professor Sparks during the Spring '12 term at University of Texas at Austin.
- Spring '12