Chapter 9, Problem 9.75PAE

9.75 Explain why each of the following chemical equations is not a correct formation reaction.

(a) $\text{4Al(s)}+{\text{3O}}_{\text{2}}\text{(g)}\to {\text{2Al}}_{\text{2}}{\text{O}}_{\text{3}}\text{(s)}$

(b) ${\text{N}}_{\text{2}}\text{(g)}+\frac{3}{2}{\text{H}}_{\text{2}}\text{(g)}\to {\text{NH}}_{\text{3}}\text{(g)}$

(c) $\text{2Na(s)}+\text{O}\left(\text{g}\right)\to {\text{Na}}_{\text{2}}\text{O(s)}$