Question

Select the statement that correctly summarizes the steps to calculate ΔHo of a reaction using bond enthalpies.

A. The sum of the bonds broken (exothermic) in the reaction is subtracted from the sum of the bonds formed (endothermic).
B. The sum of the bonds formed (endothermic) in the reaction is subtracted from the sum of the bonds broken (exothermic).
C. The sum of the bonds broken (endothermic) in the reaction is subtracted from the sum of the bonds formed (exothermic).
D. The sum of the bonds formed (exothermic) in the reaction is subtracted from the sum of the bonds broken (endothermic).

Answer 1

Option A correctly summarizes the steps to calculate ΔHo of a reaction using bond enthalpies.

Step-by-step explanation:

The correct statement that summarizes the steps to calculate ΔHo of a reaction using bond enthalpies is option A: The sum of the bonds broken (exothermic) in the reaction is subtracted from the sum of the bonds formed (endothermic).

To calculate the ΔHo of a reaction using bond enthalpies, you need to determine the energy change in breaking the bonds in the reactants and then the energy change in forming the bonds in the products. The energy change in breaking the bonds is negative (exothermic), while the energy change in forming the bonds is positive (endothermic).

By subtracting the sum of the bonds broken in the reaction from the sum of the bonds formed, you can calculate the net enthalpy change (ΔH) of the reaction.