prequiz3 - Pickering, Tracey Prequiz 3 Due: Sep 25 2005,...

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Unformatted text preview: Pickering, Tracey Prequiz 3 Due: Sep 25 2005, 6:00 pm Inst: McCord 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Choose the false statement. 1. 6 . 02 10 23 hydrogen atoms weigh 1.008 grams 2. 1 mol of carbon atoms weighs 12.0 g. 3. 6 . 02 10 23 atoms = 1 mol of atoms 4. 1 mol = 6 . 02 10 23 amu correct 5. Fluorine is a diatomic gas. Explanation: One mole contains 6.02 10 23 particles. This means that one mole of atoms would contain 6.02 10 23 atoms. 6.02 10 23 H atoms are one mole of H and we know from the periodic table that one mole of H has a mass of 1.008 g. Similarly, we know from the periodic table that one mole of carbon has a mass of 12.0 g. It is also true that flourine exists in its natural state as a diatomic gas, F 2 . The false statement is that one mole has a mass of 6.02 10 23 amu. The term refers to a specific number of atoms or molecules. The mass of one mole of particles is not a set number; rather it depends on the type of particles being discussed. 002 (part 1 of 1) 10 points Each mole of Al(NO 3 ) 3 contains how many moles of oxygen atoms? 1. 6 mol 2. 9 mol correct 3. 3 mol 4. 1 mol 5. 12 mol Explanation: There are 9 O atoms in each molecule of Al(NO 3 ) 3 . This same ratio holds for the num- ber of moles of O in one mole of Al(NO 3 ) 3...
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This note was uploaded on 06/23/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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prequiz3 - Pickering, Tracey Prequiz 3 Due: Sep 25 2005,...

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