Chapter 6, Problem 6.47QP

Interpretation Introduction

Interpretation: The more negative quantity at $\text{25°C}$ should be identified.

Concept Introduction:

The change in enthalpy that is associated with the formation of one mole of a substance from its related elements being in standard state is called standard enthalpy of formation

(${\text{ΔH}}_{\text{f}}\text{°}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

The standard enthalpy of reaction is the enthalpy of reaction that takes place under standard conditions.

To identify: Which is more negative quantity ${\text{ΔH°}}_{\text{f}}\left[{\text{H}}_{\text{2}}{\text{O}}_{\text{(l)}}\right]$ or ${\text{ΔH°}}_{\text{f}}\left[{\text{H}}_{\text{2}}{\text{O}}_{\text{(g)}}\right]$