Here, we are required to determine how the total reaction energy is calculated.
Total reaction energy =
- Energy of the product - Energy of the reactants.
The total reaction energy, otherwise known as the Enthalpy of the reaction is given by the difference between the enthalpy of the product and that of the reactants.
Also, it is important to note that the enthalpy is the sum total of the internal energy and the work energy of the entity in discuss, which may either be the reactants or the products.
Ultimately,
Total reaction energy =
- Energy of the product - Energy of the reactants.
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