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Esempio 56  
$
\begin{array}{llll}
\Solid{C}+\Gaseous{{O_2}}&=&\Gaseous{{CO_2}}&\times6\\
\G...
...quid{C_6H_6}+\frac{15}{2}{O_2}&=&6\Gaseous{{CO_2}}+3\Liquid{{H_2O}}
\end{array}$

\begin{displaymath}
\Delta{H}=6\Parenthesis{\Delta{H_f}}_{{CO_2}}+3\Parenthesis{\Delta{H_f}}_{{H_2O}}-\Parenthesis{\Delta{H_f}}_{C_6H_6}
\end{displaymath}