Chapter 7.4, Problem 7.36PP

Determine whether each of the following chemical equations is balanced or not balanced:

a. ${\text{PCl}}_{\text{3}}\left(s\right)+{\text{Cl}}_{\text{2}}\left(g\right)\to {\text{PCl}}_{\text{5}}\left(s\right)$
b. $\text{CO}\left(g\right)+{\text{ 2H}}_{\text{2}}\left(g\right)\to {\text{CH}}_{\text{4}}\text{O}\left(g\right)$
c. ${\text{2KClO}}_{\text{3}}\left(s\right)\to \text{2KCl}\left(s\right)+{\text{ O}}_{\text{2}}\left(g\right)$
d. $\text{Mg}\left(s\right)+{\text{N}}_{\text{2}}\left(g\right)\to {\text{Mg}}_{\text{3}}{\text{N}}_{\text{2}}\left(s\right)$