Question

Question #1699a

Answer 1

`triangle G "of change" = -144750J = -144.75kJ`

Explanation:

Balance the reaction

`2Hg^(2+) + Sn^(4+) --> Hg2^(2+) + Sn^(2+)`

`Sn^(4+) + 2e^- -----> Sn^(2+)` `"electrode potential at anode" = +0.15V`

`2Hg^(2+) -----> Hg2^(+2) + 2e^-` `"electrode potential at cathode" = +0.9V`

EoCell= EoRed,Cathode - EoRed,Anode

Ecell = 0.9 - 0.15 = +0.75

`triangle G "of change" = -v * F * E^o`

v is the electrons exchanged = 2e- but notice in the equation it is is written -v so take care of that
F is Faraday constant
`E^o` we know already

Answer will come in joules not in kilojoules but convert it to kilojoules because in exams examiner only accepts kilojoules as answer .

`-2 * 96500"C/mol"^(-1) * 0.75V = -144750J`

`triangle G "of change" = -144750J = -144.75kJ`