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How do I calculate bond energies?

Use average bond energies to calculate deltaH for the reaction of H2 and O2 to form water?

  • Answer:

    To find delta h using bond energies you take the total bond energy of the reactants minus the total bond energy of the products. So in other words, using the equation 2H2 + O2 --> 2H2O: (2 mol H-H x 436 kJ/mol) + (1 mol O=O x 495 kJ/mol) - (2 mol O-H 463 kJ/mol) = delta h = 441 kJ( I would check my math to be safe). Hope this helped!

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To find delta h using bond energies you take the total bond energy of the reactants minus the total bond energy of the products. So in other words, using the equation 2H2 + O2 --> 2H2O: (2 mol H-H x 436 kJ/mol) + (1 mol O=O x 495 kJ/mol) - (2 mol O-H 463 kJ/mol) = delta h = 441 kJ( I would check my math to be safe). Hope this helped!

brett

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