Textbook Problem

. Balance each of the following oxidation-reduction reactions by inspection.

a. ${\text{C}}_{\text{3}}{\text{H}}_8\left(g\right)+\text{O}\left(g\right)\to {\text{CO}}_{\text{2}}\left(g\right)+{\text{H}}_{\text{2}}\text{O}\left(g\right)$   b. $\text{CO}\left(g\right)+{\text{H}}_{\text{2}}\left(g\right)\to {\text{CH}}_3\text{OH}\left(l\right)$   c. ${\text{SnO}}_{\text{2}}\left(s\right)+\text{C}\left(s\right)\to \text{Sn}\left(s\right)+\text{CO}\left(g\right)$   d. ${\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\text{OH}\left(l\right)+{\text{O}}_{\text{2}}\left(g\right)\to {\text{CO}}_{\text{2}}\left(g\right)+{\text{ H}}_{\text{2}}\text{O}\left(g\right)$