Chapter 5, Problem 127AP

Interpretation Introduction

Interpretation:

The change in standard enthalpy is to be calculated.

Concept introduction:

The standard enthalpy for a reaction is the amount of enthalpy which is to occur under standard conditions that is room temperature and pressure.

The standard enthalpy of reaction is to be determined using the equation as given below:

$\Delta H{°}_{\text{rxn}}={\displaystyle \sum n}\Delta H_{\text{f}}^{\text{°}}\left(\text{products}\right)-{\displaystyle \sum m}\Delta H_{\text{f}}^{°}\left(\text{reactants}\right)$

Here, the stoichiometric coefficients are represented by 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.