Chapter 16, Problem 16.90SP

Interpretation Introduction

Interpretation:

The relationship between free-energy change under non-standard state conditions, free energy change under standard-state conditions and reaction quotient Q has to be outlined.

Concept Introduction:

Gibbs free energy is represented by ‘G’.  The term free energy change is represented by $\Delta G.$  $\Delta G$ thus refers to free energy change that occur in any temperature and pressure conditions other than $25°C$ and $1\text{ atm}$ pressure.  Thus $\Delta G$ refers to free energy change in non-standard state conditions.

$\Delta G°$ refers to free energy change in standard state conditions of $25°C$ and $1\text{ atm}$ pressure.  It is also termed as standard free energy change.