StudentLecture_29 - This week in CHM 11500 T HW due Friday....

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This week in CHM 11500 T HW due Friday. Final Exam: Tuesday, December 15, 8:00 AM Hall of Music ~60 % cumulative, ~40 % new material Help Session: Sunday, 13 Dec. at 1 to 3 PM in Lilly Hall 1105
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What do we do when the oil runs out? Energy sources in the U.S.A. We have lots of coal and natural gas but burning them adds to the CO 2 in the atmosphere. Perhaps the answer lies elsewhere.
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Solar energy striking the U.S.A Energy used in the U.S.A.
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Solar energy Black body Solar cell Plants Heat, steam Wind (windmills) Electricity Hydrogen Fossil fuels Biofuels Conversion of solar energy renewable
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What is renewable energy? Energy derived from the sun or from biomass produced in the last 10 years (with the exception of older garbage in land fills). Biomass all plant and plant-derived materials including animal manure, not just starch, sugar, and oil crops already used for food and/or energy. only current renewable source of liquid transportation fuel
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Relative energy of fuels Biofuels are liquids and are very useful because they can serve as fuel for transportation vehicles. ΔH (kJ/g of fuel) 2H 2 (g) + O 2 (g) 2H 2 O(l) ΔH = - 142.9 kJ/g CH 4 (g) + O 2 (g) CO 2 (g) + 2H 2 O(l)ΔH = - 55.58 kJ/g Ethanol: C 2 H 5 OH(g) + 3O 2 (g) 2CO 2 (g) + 3H 2 O(l) ΔH = - 29.7 kJ/g Biodiesel: CH 3 (CH 2 ) 16 CO 2 CH 3 (l) + 28.5 O 2 (g) 19CO 2 (g) + 19H 2 O(l) ΔH = - 40.1 kJ/g For comparison, octane: ΔH = - 42.5 kJ/g
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or coal and by the electrolysis of water, adding to atmospheric CO 2 load. C(s) + 2H 2 O(g) CO 2 (g) + 2H 2 (g) 2H 2 O(l) O 2 (g) + 2H 2 (g) (where does electricity come from? In future, perhaps wind?) These are no commercial routes to green hydrogen, yet. electrolysis
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This note was uploaded on 02/21/2010 for the course CHEM 115 taught by Professor L during the Spring '02 term at Purdue University-West Lafayette.

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StudentLecture_29 - This week in CHM 11500 T HW due Friday....

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