Chapter 4, Problem 4.27P

Interpretation Introduction

Interpretation:

The heat effect of the given reaction and total heat effect for complete metabolism of $10\text{ g}$ ethanol is to be calculated. Also, the perception of warmth which accompanies ethanol consumption is to be explained in relation with these heat effects.

Concept Introduction:

Standard heat of reaction using heat of formation is calculated by the formula:

  $\Delta H_r^{\circ }={\displaystyle \sum _{\text{products}}{n}_i\Delta {\widehat{H}}_f^{\circ }}-{\displaystyle \sum _{\text{reactants}}{n}_i\Delta {\widehat{H}}_f^{\circ }}$   ......(1)

Number of moles, $n$ is defined as:

  $n=\frac{m}{\text{MW}}$   ......(2)

Here, $m$ is the given mass of the gas and $\text{MW}$ is the molecular weight of the gas.