Blake Lecture 9-22-08

Blake Lecture 9-22-08 - Blake 9-22-08 Chemistry EX 1: Which...

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Blake 9-22-08 Chemistry EX 1: Which is the best reducing (Gain electrons) agent? 1. Lead (II) 2. Fluorine 3. Sodium (Na[s] = Na + + e - ) - ANSWER 4. Nitrate IF YOU WANT TO REDUCE SOMETHING, GIVE IT ELECTRONS. REDUCIN AGENT GIVES UP ELECTRONS. Combustion Analysis EX 2: 0.1075 grams of a hydrocarbon is burned to give 0.3225 grams of carbon dioxide and 0.1759 grams of water. What is the empirical formula of the hydrocarbon? 1. (0.3225 grams of CO2 / 44.01 GFM) = 0.00733 moles of CO2 & (0.1759 grams of H20 / 18 GFM) = 0.009772 moles of H2O 2. C ? H ? + O 2 = CO 2 + H 2 O 3. 0.00977 * 2 = 0.01954 moles of H 4. 0.00733 * 1 = 0.00733 moles of C 5. C 1 H 2.667 * 3 = C 3 H 8 Percent Yield EX 3: If you react 4.5 grams of methane with 15 grams of oxygen to yield 6.5 grams of water, what is the percent yield of water? 1. CH 4 + 2O 2 = CO 2 + 2H 2 O 2. 4.5 g 15 g 3. .281 moles of CH 4 2 4. .281 * (2 O 2 / 1 CH 4 ) = 0.5626 moles of H2O needed 5. 0.489 * (2/2) = 0.489 moles of H2O
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This note was uploaded on 03/22/2011 for the course CHEMISTRY 1307 taught by Professor Tamarahanna during the Spring '09 term at Texas Tech.

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Blake Lecture 9-22-08 - Blake 9-22-08 Chemistry EX 1: Which...

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