Chapter 5, Problem 92AP

Interpretation Introduction

Interpretation:

The cooling effect of ethanol when rubbed on skin is to be explained.

Concept introduction:

The standard enthalpy for a reaction is the amount of enthalpy that occursunder 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 productsand the enthalpy of formation understandard conditions isrepresented by $\Delta H_{\text{f}}^{°}$.