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Hess - the reactants Hess’s Law in a more useful form is...

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Hess’s Law Example 15-7: Given the following equations and DH o values calculate DH o for the reaction below. Hess’s Law The + sign of the DH o value tells us that the reaction is endothermic. The reverse reaction is exothermic, i.e., Hess’s Law Hess’s Law states : for any chemical reaction at standard conditions, the standard enthalpy change is the sum of the standard molar enthalpies of formation of the products (each multiplied by its coefficient in the balanced chemical equation) minus the corresponding sum for
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Unformatted text preview: the reactants. Hess’s Law in a more useful form is written: Hess’s Law Example 15-8: Calculate the ∆ H o 298 for the following reaction from data in Appendix K. Bond Energies Bond energy is the amount of energy required to break the bond and separate the atoms in the gas phase. To break a bond always requires an absorption of energy ! Bond Energies Table of average bond energies...
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