São dadas as seguintes equações químicas:

I - $2\mathrm{A}\ell +3\mathrm{H}{}_2\mathrm{SO}{}_4\to \mathrm{A}\ell 2(\mathrm{SO}{}_4){}_3+3\mathrm{H}{}_2$

II - $2\mathrm{Na}{}_3\mathrm{A}\ell \mathrm{F}{}_6+6\mathrm{H}{}_2\mathrm{SO}{}_4\to 3\mathrm{Na}{}_2\mathrm{SO}{}_4+\mathrm{A}\ell {}_2(\mathrm{SO}{}_4){}_3+12\mathrm{HF}$

III - $2\mathrm{Na}{}_3\mathrm{A}\ell \mathrm{F}{}_6+3\mathrm{H}{}_2\mathrm{SO}{}_4\to 3\mathrm{Na}{}_2\mathrm{SO}{}_4+2\mathrm{A}\ell \mathrm{F}{}_3+6\mathrm{HF}$

IV - $\mathrm{A}\ell {}_2(\mathrm{SO}{}_4){}_3+6\mathrm{NH}{}_4\mathrm{OH}\to \mathrm{A}\ell (\mathrm{OH}){}_3+3(\mathrm{NH}{}_4){}_2\mathrm{SO}{}_4$

V - $\mathrm{A}\ell \mathrm{F}{}_3+3\mathrm{NH}{}_4\mathrm{OH}\to \mathrm{A}\ell (\mathrm{OH}){}_3+3\mathrm{NH}{}_4\mathrm{F}$

VI - $\mathrm{A}\ell {}_2(\mathrm{SO}{}_4){}_3+2\mathrm{NH}{}_3\to 2\mathrm{A}\ell \mathrm{N}+3\mathrm{H}{}_2\mathrm{SO}{}_4$

VII - $2\mathrm{A}\ell (\mathrm{OH}){}_3\to \mathrm{A}\ell {}_2\mathrm{O}{}_3+3\mathrm{H}{}_2+\frac{3}{2}\mathrm{O}{}_2$

VIII - $2\mathrm{A}\ell \mathrm{N}+\frac{5}{2}\mathrm{O}{}_2\to \mathrm{A}\ell {}_2\mathrm{O}{}_3+2\mathrm{NO}$

IX - $2\mathrm{A}\ell (\mathrm{OH}){}_3\to \mathrm{A}\ell {}_2\mathrm{O}{}_3+3\mathrm{H}{}_2\mathrm{O}$

As reações químicas que ocorrem nas etapas a, b, c da pergunta anterior [INSERIR LINK] são respectivamente representadas pelas equações: