Candidate 2011 Posted June 6, 2011 Report Share Posted June 6, 2011 My Chem class is having a major dispute at the moment over what the formula is for bond enthalpy change!! Any one like to make an input?? Reply Link to post Share on other sites More sharing options...
Drake Glau Posted June 6, 2011 Report Share Posted June 6, 2011 (edited) The total bond enthalpy of the reactants minus the total bond enthalpy of the products. It's the only thing in energetics that does reactants-products Sidenote: the actual bond enthalpies don't change (C-H bond's enthalpy won't change for example, check your data booklet for the value ). This is finding the enthalpy change of the reaction based off bond enthalpies. Since breaking bonds is endothermic (meaning it requires energy) and forming bonds is exothermic (it releases energy) it would be the amount of energy it absorbed minus the amount of energy it released by breaking/forming the bonds in the reaction giving you the overall change of the H for the reaction. Hope this made sense. especially after 5 edits of me reversing stuff Edited June 6, 2011 by Drake Glau Reply Link to post Share on other sites More sharing options...
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