2C(s) + O2(g) → 2CO(g)
\[n_\mathrm{C} = \frac {m_\mathrm{C}}{M_\mathrm{C}} = \frac {20\mathrm{g}}{12,01\frac {\mathrm{g}}{\mathrm{mol}}} = 1,66527893\mathrm{mol} \\ n_\mathrm{C}:n_\mathrm{CO} = 1:1 \\ n_\mathrm{CO} = n_\mathrm{C} = 1,66527893\mathrm{mol}\]
\[n_\mathrm{Fe_2O_3} = \frac {m_\mathrm{Fe_2O_3}}{M_\mathrm{Fe_2O_3}} = \frac {2000\mathrm{g}}{(55,85 \cdot 2 + 16,00 \cdot 3)\mathrm{g/mol}} = 12,5234815\mathrm{mol}\]
Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)
\[n_\mathrm{Fe_2O_3}:n_\mathrm{CO} = 1:3 \\ \frac {n_\mathrm{Fe_2O_3}}{n_\mathrm{CO}} = \frac {12,5234815\mathrm{mol}}{1,66527893\mathrm{mol}} = 7,52035066 > \frac {1}{3}\]
\(n_\mathrm{CO}\) är begränsande.
\[n_\mathrm{CO}:n_\mathrm{Fe} = 3:2 \\ n_\mathrm{Fe} = \frac {2}{3}n_\mathrm{CO} = \frac {2}{3} \cdot 1,66527893 = 1,11018596\mathrm{mol} = 62,0038857\mathrm{g} ≈ 62\mathrm{g}\]
