Question #1699a

1 Answer
Feb 27, 2017

Answer:

#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#