Chapter 7.4, Problem 7.37PP

Balance each of the following chemical equations:

a. ${\text{N}}_{\text{2}}\left(g\right)+{\text{O}}_{\text{2}}\left(g\right)\to \text{ NO}\left(g\right)$
b. $\text{HgO}\left(s\right)\stackrel{\Delta }{\to }\text{Hg}\left(l\right)+{\text{ O}}_{\text{2}}\left(g\right)$
c. $\text{Fe}\left(s\right)+{\text{ O}}_{\text{2}}\left(g\right)\to {\text{Fe}}_{\text{2}}{\text{O}}_{\text{3}}\left(s\right)$
d. $\text{Na}\left(s\right)+{\text{ Cl}}_{\text{2}}\left(g\right)\to \text{NaCl}\left(s\right)$