Chapter 5, Problem 78QP

Interpretation Introduction

Interpretation:

The reason for the decomposition tendency of ${\text{H}}_{\text{2}}{\text{O}}_2\left(l\right)$ into ${\text{H}}_{\text{2}}\text{O}\left(l\right)$ and ${\text{O}}_2\left(g\right)$.

Concept introduction:

The standard enthalpy of formation is the amount of heat change, which arises as a result of formation of 1 mole of a compound from its integral elements at their standard states.

The standard enthalpy of formation of any element in its standard state is zero, which is also known as the most stable state.