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# bond-energies-answers - 10.a O=O H-O-H O=C=O b C 25 H 52...

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8. 2H 2 O 2H 2 + O 2 H-O-H + H-O-H H-H + H-H + O=O O=O H-H H-O released # required # kJ/mol Bond 498 1 498 1370 1836 466 872 2 436 1836 4 459 2H 2 O + 466 kJ 2H 2 + O 2

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2. Forming a bond releases energy 3. Breaking a bond requires energy 4. The energy required to break a chemical bond: the energy released when a bond is formed 5. Endothermic 6. Exothermic 7. a) H-F (568 kJ/mol) b) O-O (145 kJ/mol) 9. H-Cl Cl-Cl H-H released # required # kJ/mol Bond H 2 + Cl 2 2HCl + 185 kJ 864 2 432 864 679 185 243 1 243 436 1 436
d) theoretical: 15000 kJ, lab: 7500 kJ The lab value is about 50% of what it should have been because the calorimeter was very inefficient – lots of heat energy was lost. 10.a) O=O, H-O-H, O=C=O

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Unformatted text preview: 10.a) O=O, H-O-H, O=C=O b) C 25 H 52 + 38O 2 → 25CO 2 + 26H 2 O c) C=O H-O O=O C-H C-C released # required # kJ/mol Bond 399 50 50 799 238 68 52 459 189 24 38 498 638 18 487 52 150 66 214 76 52 413 8352 24 348 C 2 H 5 OH + 3O 2 → 2CO 2 + 3H 2 O + 122 4 kJ Thus,molar heat of combustion, ∆ Hc=1224 kJ/mol 11.C 2 H 5 OH + 3O 2 → 2CO 2 + 3H 2 O O=O H-O C-O C=O C-H C-C released # required # kJ/mol Bond 149 4 3 498 275 4 6 459 1 459 360 1 360 319 6 4 799 5950 4726 1224 206 5 5 413 348 1 348 For more lessons, visit www.chalkbored.com...
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