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http://www.chemguide.co.uk/physical/energetics/bondenthalpies.html
http://www.avogadro.co.uk/definitions/hbond.htm
http://www.kentchemistry.com/links/Kinetics/BondEnergy.htm
http://www.chemteam.info/Thermochem/HessLawIntro3.html
http://en.wikipedia.org/wiki/Bond_energy
http://chemwiki.ucdavis.edu/Theoretical_Chemistry/Chemical_Bonding/Gener...
http://chemistry.about.com/od/workedchemistryproblems/a/bondenergyexmpl.htm
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