Chapter 18, Problem 18.105QP

Interpretation Introduction

Interpretation:

The standard free energy of formation $\left({\text{ΔG}}^{\text{o}}{}_{\text{f}}\right)$ of acetone has to be calculated.

Concept introduction:

Standard free energy change:

Standard free energy change is measured by subtracting the product of temperature and standard entropy change from the standard enthalpy change of a system.

$\begin{array}{l}{\text{ΔG}}^{\text{o}}\text{=}{\text{ΔH}}^{\text{o}}\text{-}{\text{TΔS}}^{\text{o}}\\ \text{where,}\\ {\text{ΔG}}^{\text{o}}\text{-}\text{standard}\text{free}\text{energy change}\\ {\text{ΔH}}^{\text{o}}\text{-}\text{standard}\text{enthalpy}\text{change}\\ {\text{ΔS}}^{\text{o}}\text{-}\text{standard}\text{entropy change}\text{and T}\text{-}\text{temperature}\text{.}\end{array}$

Standard free energy of formation:

The change in free energy for the formation of $\text{1}\text{mole}$ of any substance from its starting materials in their standard (stable) states (i.e. $\text{1}\text{atm}\text{and}\text{25}{}^{\text{o}}\text{C}$).

To calculate: the value of ${\text{ΔG}}^{\text{o}}{}_{\text{f}}$ for acetone