Chapter 22, Problem 109IAE

Interpretation Introduction

Interpretation:

The enthalpy diagram for the formation of ${\text{XeO}}_{\text{2}}$ from Xe and ${\text{O}}_{\text{2}}$ should be constructed and ${\Delta }_r{\text{H}}^o$ for the formation of it with the help of given bond energy and whether this result support the given observation or not needs to be determined.

Concept introduction:

The enthalpy diagram represents all the possible steps for the formation of substances from its respective components in their standard state.

The standard enthalpy of formation can be defined as the energy change during the formation of one mole of substance from its constituent elements in their standard state. It is denoted as $\Delta {\text{H}}_{\text{f}}^{°}$ and can be calculated with the help of bond energy values of reactant and products. The relation between $\Delta {\text{H}}_{\text{f}}^{°}$ and bond energy values can be shown as:

${\text{ΔH}}_{\text{rxn}}{\text{=ΣBE}}_{\text{reactants}}{\text{-ΣBE}}_{\text{products}}$

The negative value of standard enthalpy of formation indicates stability of molecule.