Chapter 4, Problem 80E

Balance each of the following oxidation−reduction reactionsby using the oxidation states method.
a. ${\text{C}}_{\text{2}}{\text{H}}_{\text{6}}\text{(}g{\text{)+O}}_{\text{2}}\text{(}g\text{)}\to {\text{CO}}_{\text{2}}\text{(}g{\text{)+H}}_{\text{2}}\text{O(}g\text{)}$
b. $\text{Mg(}s\text{)+HCl(}aq\text{)}\to {\text{Mg}}^{\text{2+}}\text{(}aq{\text{)+Cl}}^{\text{–}}\text{(}aq{\text{)+H}}_{\text{2}}\text{(}g\text{)}$
c. $\text{Cu(}s{\text{)+Ag}}^{\text{+}}\text{(}aq\text{)}\to {\text{Cu}}^{\text{2+}}\text{(}aq\text{)+Ag(}s\text{)}$
d. $\text{Zn(}s{\text{)+H}}_{\text{2}}{\text{SO}}_{\text{4}}\text{(}aq\text{)}\to {\text{ZnSO}}_{\text{4}}\text{(}aq{\text{)+H}}_{\text{2}}\text{(}g\text{)}$