# Question 19.5: Calculating ΔG° from Standard Free Energies of Formation Cal...

**Calculating** \Delta G^{\circ} **from Standard Free Energies of Formation**

Calculate \Delta G^{\circ} for the combustion of 1 \mathrm{~mol} of ethanol, \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}, at 25^{\circ} \mathrm{C}.

\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(l)+3 \mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{CO}_{2}(g)+3 \mathrm{H}_{2} \mathrm{O}(g)

Use the standard free energies of formation given in Table 19.2.

**PROBLEM STRATEGY**

Calculate \Delta G^{\circ} from \Delta G_{f}^{\circ} values, similar to the way you calculate \Delta H^{\circ} from \Delta H_{f}^{\circ}.

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