Textbook Problem

. For each of the following unbalanced oxidation-reduction chemical equations, balance the equation by inspection, and identify which species is the reducing agent.

a. $\text{Fe}\left(s\right)+{\text{O}}_{\text{2}}\left(\text{g}\right)\to {\text{Fe}}_{\text{2}}{\text{O}}_3\left(s\right)$   b. $\text{Al}\left(s\right)+{\text{Cl}}_{\text{2}}\left(g\right)\to {\text{AlCl}}_{\text{3}}\left(s\right)$   c. $\text{Mg}\left(s\right)+{\text{P}}_{\text{4}}\left(s\right)\to \text{Mg}{3}_{}{\text{P}}_{\text{2}}\left(s\right)$