Chapter 5, Problem 122AP

Interpretation Introduction

Interpretation:

The amount of heat produced by a $250\text{ g}$ packet of iron is to be determined.

Concept introduction:

The standard enthalpy for a reaction is the amount of enthalpy that occurs under standard conditions.

The standard enthalpy of a reaction is determined by using the equation given below:

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

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

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