Chapter 4, Problem 40E

Balance each of the following equations according to the half-reaction method:

(a) $\text{Zn}\left(s\right)+{\text{NO}}_3{}^{-}\left(aq\right)\to {\text{Zn}}^{2+}\left(aq\right)+{\text{N}}_2\left(g\right)\left(\text{in acid}\right)$

(b) $\text{Zn}\left(s\right)+{\text{NO}}_3{}^{-}\left(aq\right)\to {\text{Zn}}^{2+}\left(aq\right)+{\text{NH}}_2\left(aq\right)\left(\text{in base}\right)$

(c) $\text{CuS}\left(s\right)+{\text{NO}}_3{}^{-}\left(aq\right)\to {\text{Cu}}^{2+}\left(aq\right)+\text{S}\left(s\right)+\text{NO}\left(g\right)\left(\text{in acid}\right)$

(d) ${\text{NH}}_2\left(g\right)+{\text{O}}_2\left(g\right)\to {\text{NO}}_2\left(g\right)\left(\text{gase phase}\right)$

(e) ${\text{Cl}}_2\left(g\right)+{\text{OH}}^{-}\left(aq\right)\to {\text{Cl}}^{-1}\left(aq\right)+{\text{Cl}}_3{}^{-}\left(aq\right)\left(\text{in base}\right)$

(f) ${\text{H}}_2{\text{O}}_2\left(aq\right)+{\text{MnO}}_4{}^{-}\left(aq\right)\to {\text{Mn}}^{2+}\left(aq\right)+{\text{O}}_2\left(g\right)\left(\text{in acid}\right)$

(g) ${\text{NO}}_2\left(g\right)\to {\text{NO}}_3{}^{-}\left(aq\right)+{\text{NO}}_2{}^{-}\left(aq\right)\left(\text{in base}\right)$

(h) ${\text{Fe}}^{3+}\left(aq\right)+{\text{I}}^{-}\left(aq\right)\to {\text{Fe}}^{2+}\left(aq\right)+{\text{I}}_2\left(aq\right)$