Hydrogenation reactions are used to add hydrogen across...

Hydrogenation reactions are used to add hydrogen across double bonds in hydrocarbons and other organic compounds. Use average bond energies to calculate $\Delta H_{\mathrm{rxn}}$ for the hydrogenation reaction.

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Key Concepts

Reaction Enthalpy Calculation Using Average Bond Energies

This method involves calculating the total energy needed to break all bonds in the reactants and subtracting the total energy released from newly formed bonds in the products. The difference gives an estimate of the reaction enthalpy (?H_rxn).

Exothermic Reaction

When a reaction releases more energy upon formation of new bonds than it consumes to break the initial bonds, the overall enthalpy change is negative, indicating an exothermic reaction. Hydrogenation reactions are typically exothermic due to the strong bond formation in the product.

Hydrogenation Reaction

A hydrogenation reaction involves the addition of hydrogen (H?) across unsaturated bonds such as double or triple bonds in organic molecules. This conversion typically transforms an unsaturated compound into a saturated one and is often catalyzed by metals like platinum, palladium, or nickel.

Bond Energies

Bond energies represent the average energy required to break a specific type of bond in a molecule. They are used as an approximate measure of bond strength and facilitate the estimation of reaction enthalpies by considering the energy changes involved in breaking and forming bonds.

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