Lesson: Bond Energy Chemistry • The Molecular Nature of Matter and Change • Eighth Edition

Chemistry

In this lesson, we will learn how to use net changes in bond energy during reactions to calculate the bond energies of reactants and products.

Sample Question Videos

Q1:

To the nearest kJ/mol, what is the bond energy of ?

Bond
Bond Energy (kJ/mol)	436	243

Q2:

Ethene and iodine react to form 1,2-diiodoethane. The equation for this reaction is shown.

The total energy change per mole of ethene reacted is kJ/mol. The energies of selected bonds in the reactants and products are given in the table.

Bond
Energy (kJ/mol)	346	602	411	148

Calculate, to the nearest kilojoules per mole, the bond energy of the bond.

Q3:

Which of the following hydrogen halides has the smallest bond enthalpy?

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