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Hess's Law, Bond Energy & Born-Haber

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  1. 1.

    Using bond energies: C-H = 413, C-C = 348, C=C = 614, H-H = 436 kJ/mol, the enthalpy of hydrogenation of ethene (C2H4 + H2 -> C2H6) is: ```smiles C=C ``` Ethene (C2H4) — hydrogenated to ethane (C2H6)

  2. 2.

    The standard enthalpy of formation of an element in its standard state is:

  3. 3.

    The enthalpy of combustion is always:

  4. 4.

    Using Hess's law with combustion enthalpies: delta_H_rxn = ?

  5. 5.

    For the reaction 2CO(g) + O2(g) -> 2CO2(g), given delta_Hf(CO) = -110 kJ/mol and delta_Hf(CO2) = -393 kJ/mol, delta_H_rxn is:

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