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Bond Energy: B.E. The Energy Required to Break a Bond

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Presentation on theme: "Bond Energy: B.E. The Energy Required to Break a Bond"— Presentation transcript:

1 Bond Energy: B.E. The Energy Required to Break a Bond
O - H Bond Energy = 467 kJ/mol Potential Energy ...Strong bond C - H Bond Energy = 413 kJ/mol ...Weaker bond B.E. B.E.

2 Bond Energies: Chemical Reactions
CH4(g) + 2O2(g) CO2(g) + 2H2O(g) O H C H O + + O C O H O Bonds Broken (Endothermic) Bonds Made (Exothermic) 4 C-H Bonds @ 413 kJ/mol 4 O-H Bonds @ 467 kJ/mol 2 O=O Bonds @ 498 kJ/mol 2 C=O Bonds @ 799 kJ/mol Making Bonds Total E. Breaking Bonds Total E. = (4  413) + (2  498) = (4  467) + (2  799) = kJ/mol = 2648 kJ/mol

3 Bond Energies: Chemical Reactions
+ + H O C O C H O O O H H H Breaking Bonds Total E. Making Bonds Total E. = (4  413) + (2  498) = (4  467) + (2  799) = 2648 kJ/mol = kJ/mol Hcombustion = B.E.reactants B.Eproducts Hcombustion = kJ/mol kJ/mol Hcombustion = kJ/mol (rxn is exothermic)


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