Download presentation
Presentation is loading. Please wait.
Published byJan Tønnessen Modified over 5 years ago
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)
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.