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CH 201 Lecture 05 2009s

CH 201 Lecture 05 2009s - CH 201 Thursday October 15 The...

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CH 201 Thursday, October 15 “The Mole”
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Announcement World premiere of “Not Evil Just Wrong” This Sunday, October 18 7pm, Milam Auditorium, OSU campus Free of charge Extra credit for CH 201 available Pick up question sheet if interested Mark your calendar
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Review: What is the name for NiS? 1. Nickel sulfide 2. Nickel(I) sulfide 3. Nickel(II) sulfide 4. Nickel sulfur 5. Nulfur millerite
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Molecular Masses Mass of molecule = sum of masses of atoms Example: H 2 O Try some: What are the molecular masses of the following? H 2 CO 2 C 6 H 12 O 6 (glucose) Ionic compounds do not form molecules The mass of NaCl, for example, is called a formula mass
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What is the formula mass of NaHCO 3 (baking soda)? 1. 75.02 2. 84.02 3. 88.04 4. 96.01
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Percent Composition What percent of a water molecule is hydrogen by mass ? Therefore what percent is oxygen? This is the percent composition of water: What is the percent composition of nitroglycerin (C 3 H 5 N 3 O 6 )?
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What percent of aspirin is oxygen?
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