c161l29_11_14 - Bond Strengths Bond Strengths W In chapter...

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Unformatted text preview: Bond Strengths Bond Strengths W In chapter 6, we discussed enthalpies of formation H f enthalpy to form 1 mole of a compound from elements in standard states have to break bonds and form new ones stronger bonds means more energy involved W Strength of bonds measured by bond enthalpy H B Energy of dissociation (gas phase) H 2 (g) 2H H B = 436 kJ/mol Measuring bond strength Measuring bond strength W For simple, diatomic molecules we can directly measure bond enthalpies W The strength of the bond depends primarily on the 2 atoms involved Some variation due to near-by atoms report average bond enthalpies Measure Measure H B for C for C-H in 100 different compounds, and H in 100 different compounds, and report average report average Using bond enthalpies Using bond enthalpies W We can estimate reaction enthalpies Put energy in to break bonds on the reactant side Get energy back by forming bonds on the product side W Bond enthalpies are a way to estimate reaction enthalpies H r H B (bonds broken) - H B (bonds formed) Only valid in gas phase Example: 3 ways...
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c161l29_11_14 - Bond Strengths Bond Strengths W In chapter...

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