Chapter 9, Problem 9.53PAE

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

1. $4\text{Al}\left(\text{s}\right)+3{\text{O}}_{\text{2}}\left(\text{g}\right)\to 2{\text{Al}}_{\text{2}}{\text{O}}_3\left(\text{s}\right)$

${\text{N}}_{\text{2}}\left(\text{g}\right)+\frac{3}{2}{\text{H}}_2\left(\text{g}\right)\to {\text{NH}}_3\left(\text{g}\right)$

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