Chem_208_03_Web

Chem_208_03_Web - What is the energy released by combustion...

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PS1 Due Friday, 2PM Supplemental Problems for PS1 (don’t hand in) Ch 7: 5, 9, 11, 19, 25, 27, 31 2007 Spring Rush Information Sessions Wed. Jan. 31, 4:45PM Baker 135 Thurs. Feb. 1, 4:45PM Olin Hall 255 Fri. Feb. 2, 4:45PM Baker 119
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The Bomb Complete Apparatus Volume is constant Pressure increases
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Bomb Calorimeter (an isolated system) System includes everything inside dewar: Bomb, reactants, water, thermometer, stirrer…
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Calibration Step Determination of Heat Capacity of Calorimeter • Heat of combustion of benzoic acid (C 7 H 6 O 2 ) in 30 atm O 2 : q rxn = - 26.43 kJ/gram printed on bottle • Combustion of 1.346g in 30 atm O 2 : T = 16.58 o C measured • Calculate C for calorimeter:
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The Measurement Calorimeter was emptied and loaded with 1.526g of benzene (C 6 H 6 ) + 30 atm O 2 Temperature increased by 29.76 o C upon combustion.
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Unformatted text preview: What is the energy released by combustion of benzene in kJ/mol? Chemical Reactions-often release energy as heat. How else might energy be released?? Light: Flame (common) Chemiluminescence (not common) Work: When gases are produced (common) Gummy Bear Sacrifice (Combustion of Sugar) When heated, potassium chlorate decomposes: 2 KClO 3 (s) → 2KCl (s) + 3O 2 (g) This provides sufficient oxygen to oxidize the sugar In the gummy bear, an exothermic reaction: C 12 H 22 O 11 (s) + 3O 2 → 9C(s) + 3CO 2 (g) + H 2 O ∆ H = -5635 kJ Reactions can do work e.g.2KClO 3 (s) → 2KCl (s) + 3O 2 (g) Pressure-Volume Work 2NaN 3 (s) → 2Na(s) + 3N 2 (g) How much work is done in Filling an Airbag? - Assume 333.4g Sodium Azide- N 2 isproduced at 60 o C. W = -P ex ∆ V...
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This note was uploaded on 05/18/2008 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell.

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Chem_208_03_Web - What is the energy released by combustion...

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