Questão 6. Usando os dados apresentados a 298 K , calcule os valores de
\Delta \mathrm{H}^{\circ} e
\Delta \mathrm{S}^{\circ} para as seguintes reações. Utilizando os valores previstos de
\Delta \mathrm{H}^{\circ} e
\Delta \mathrm{S}^{\circ}, calcule
\Delta \mathrm{G}^{\circ} para as reações e indique a espontaneidade das mesmas.
\mathrm{H}_{2}(\mathrm{~g})+\mathrm{F}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{HF}(\mathrm{g})
DADOS:
\Delta \mathrm{H}_{\mathrm{f}}^{\mathrm{o}_{( }} \mathrm{H}_{2(\mathrm{~g})}=0 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta \mathrm{H}_{\mathrm{f}}^{\mathrm{o}_{
}} \mathrm{F}_{2(\mathrm{~g})}=0 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta \mathrm{H}_{\mathrm{f}}^{\mathrm{o}_{
}}\left(\mathrm{HF}_{(\mathrm{g})}\right)=-268,61 \mathrm{~kJ} \mathrm{~mol}^{-1} ;
\mathrm{S}^{o}\left(\mathrm{H}_{2(\mathrm{~g})}\right)=130,58 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} ; \mathrm{S}^{o}\left(\mathrm{~F}_{2(\mathrm{~g})}\right)=202,7 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} ; \mathrm{S}^{o}(\mathrm{HF}(\mathrm{g}))=173,51 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1};
\Delta \mathrm{H}^{0}\left(\mathrm{C}_{(\mathrm{s}, \text { grafite })}}\right)=0 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta \mathrm{H}_{
}\left(\mathrm{Cl}_{2(\mathrm{~g})}\right)=0 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta \mathrm{H}_{
}\left(\mathrm{CCl}_{4(\mathrm{~g})}\right)=-106,7 \mathrm{~kJ} \mathrm{~mol}^{-1};
\mathrm{S}^{\circ}\left(\mathrm{C}_{(\mathrm{s}, \text { grafite })}}\right)=5,69 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} ; \mathrm{S}^{\circ}\left(\mathrm{Cl}_{2(\mathrm{~g})}\right)=222,96 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} ; \mathrm{S}^{\circ}\left(\mathrm{CCl}_{4(\mathrm{~g})}\right)=309,4 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1};
\Delta \mathrm{H}_{
}\left(\mathrm{Fe}_{2} \mathrm{O}_{3(\mathrm{~s})}\right)=-1117,1 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta \mathrm{H}_{
}\left(\mathrm{FeCl}_{3(\mathrm{~s})}\right)=-400 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta \mathrm{H}_{
}\left(\mathrm{O}_{2(\mathrm{~g})}\right)=0 \mathrm{~kJ} \mathrm{~mol}^{-1};
\mathrm{S}^{\circ}\left(\mathrm{Fe}_{2} \mathrm{O}_{3(\mathrm{~s})}\right)=52,92 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \mathrm{S}^{\circ}\left(\mathrm{FeCl}_{3(\mathrm{~s})}\right)=142,3 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} ; \mathrm{S}^{\circ}\left(\mathrm{O}_{2(\mathrm{~g})}\right)=205 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}.