What is the relationship between enthalpy change and bond dissociation energy?

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Question: What is the relationship between enthalpy change and bond dissociation energy?

Options:

Correct Answer: ΔH is the sum of bond dissociation energies of reactants minus products.

Solution:

The enthalpy change (ΔH) for a reaction can be calculated as the sum of the bond dissociation energies of the reactants minus that of the products.

What is the relationship between enthalpy change and bond dissociation energy?

What is the relationship between enthalpy change and bond dissociation energy?

Step 1: Understand that enthalpy change (ΔH) is the heat energy change during a chemical reaction.
Step 2: Know that bond dissociation energy is the energy required to break a bond between two atoms in a molecule.
Step 3: Identify the bonds in the reactants (the starting materials) and their corresponding bond dissociation energies.
Step 4: Identify the bonds in the products (the substances formed) and their corresponding bond dissociation energies.
Step 5: Calculate the total bond dissociation energy for all the bonds in the reactants.
Step 6: Calculate the total bond dissociation energy for all the bonds in the products.
Step 7: Subtract the total bond dissociation energy of the products from that of the reactants: ΔH = (Total energy of reactants) - (Total energy of products).
Step 8: The result gives you the enthalpy change for the reaction.

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