Rappresenta la $K_{\mathrm{C}}$ delle seguenti reazioni:
$$
\begin{aligned}
& \mathrm{Sn}_{(s)}+2 \mathrm{Cl}_{2(g)} \rightleftarrows \mathrm{SnCl}_{4(g)} \\
& 2 \mathrm{C}_{(s)}+3 \mathrm{H}_{2(g)} \rightleftarrows \mathrm{C}_2 \mathrm{H}_{6(g)} \\
& 3 \mathrm{Fe}_2 \mathrm{O}_{3(s)}+\mathrm{H}_{2(g)} \rightleftarrows \mathrm{H}_2 \mathrm{O}_{(g)}+2 \mathrm{Fe}_3 \mathrm{O}_{4(s)}
\end{aligned}
$$
un aiutino
