Chapter 5, Problem 81AP

Interpretation Introduction

Interpretation:

The zero value of enthalpy of formation, for elements in their most stable form cannot be applied to nuclear reactions, is to be explained.

Concept introduction:

The standard enthalpy for a reaction is the amount of enthalpy at standard conditions

The standard enthalpy of reaction is to be determined using the equation as given below: $\Delta H{°}_{\text{rxn}}={\displaystyle \sum n}\Delta H_{\text{f}}^{°}\left(\text{products}\right)-{\displaystyle \sum m}\Delta H_{\text{f}}^{\text{°}}\left(\text{reactants}\right)$

Here, the stoichiometric coefficients are represented as m for reactants and n for products, enthalpy of formation at standard conditions is represented by $\Delta H_{\text{f}}^{°}$.

The value of enthalpy of formation of an element is zero at its most stable state.