Chapter 8, Problem 4SEPP

Interpretation Introduction

Interpretation:

The reason for the fact that the calculated value of $\Delta H_{\text{f}}°$ differs from the tabulated value, that is, $81.56\text{kJ/mol}$ is to be given.

Concept Introduction:

The formula used to calculate the standard heat of formation as:

$\Delta H_{\text{f}}°={\displaystyle \sum \Delta H_{\text{f}}°\left(\text{Products}\right)}-{\displaystyle \sum \Delta H_{\text{f}}°\left(\text{Reactants}\right)}.$

In enthalpy, a thermodynamic system contains the addition of internal energy with the product of its pressure and volume.