Chapter 5.6, Problem 3CP

Interpretation Introduction

Interpretation:

Thevalue of enthalpy of a reaction, which corresponds to the enthalpy of formation, out of the given values is to be identified.

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

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