Chapter 4, Problem 4.7CP

Interpretation Introduction

Interpretation:

The statement that the superscript zero in ${\text{ΔH}}_{\text{f}}^{\text{0}}$ means that the reaction conditions are 298.15 K needs to be justified.

Concept Introduction:

Standard state of a substance is the phase at which it exists at a temperature of 298 K and 1 bar pressure The standard enthalpy of formation ${\text{ΔH}}_{\text{f}}^{\text{0}}$ is the amount of heat evolved during the formation of 1 mole of a substance from its constituent elements present in their standard state.