Chapter 19, Problem 25E

Determine the values of ${\Delta }_{t}G°$ for the following reaction carried in voltaic cells.

a. $\text{2Al}\left(\text{s}\right)+3{\text{Cu}}^{\text{2+}}\left(\text{aq}\right)\to 2{\text{Al}}^{\text{2+}}\left(\text{aq}\right)+3\text{Cu}\left(\text{s}\right)$

b. ${\text{O}}_{\text{2}}\left(\text{g}\right)+4{\text{l}}^{\text{-}}\left(\text{aq}\right)+4{\text{H}}^{\text{+}}\left(\text{aq}\right)\to 2{\text{H}}_{\text{2}}\text{O}\left(\text{l}\right)+2{\text{l}}_{\text{2}}\left(\text{s}\right)$

c. ${\text{Cr}}^{\text{2}}{\text{O}}_{\text{7}}^{\text{2-}}\left(\text{aq}\right)+14{\text{H}}^{\text{4}}\left(\text{aq}\right)+6\text{Ag}\left(\text{s}\right)\to 2{\text{Cr}}^{\text{2+}}\left(\text{aq}\right)+6{\text{Ag}}^{+}\left(\text{aq}\right)+7{\text{H}}_{\text{2}}\text{O}\left(\text{l}\right)$