question_answer

Consider the following half-cell reactions and associated standard half-cell potentials, and determine the maximum voltage that can be obtained by combination resulting in spontaneous processes : \[AuBr_{4}^{-}\,(aq)+3{{e}^{-}}\xrightarrow{{}}Au(s)+4B{{r}^{-}}(aq);\,E{}^\circ =-\,0.86\,V\] \[E{{u}^{3+}}(aq)\,+\,{{e}^{~-}}\xrightarrow{{}}E{{u}^{2+}}\,(aq);\,\,E{}^\circ \,=-\,0.43\,V\] \[S{{n}^{2+}}(aq)\,+2\,{{e}^{~-}}\xrightarrow{{}}Sn\,(s);\,\,E{}^\circ \,=-\,0.14\,V\] \[I{{O}^{-}}(aq)+{{H}_{2}}O\,(l)+2{{e}^{-}}\xrightarrow{{}}{{I}^{-}}(aq)+2O{{H}^{-}}\,(aq);\]            \[E{}^\circ =+0.49\,V\]

Answer:

1.35