The cell potential `(E_(cell))` of a reaction is related as `/_\G=-nF E_(cell)`, where `/_\G` represents max. useful electrical work n=no. of moles of electrons exchanged during the section for reversible cell reaction `d(/_\G)=(/_\_rV)dp-(/_\_rS),dT` at constant pressure `d(/_\G)=-(/_\_rS).dT` :' At constant pressure `/_\G``=/_\H-T./_\S` :. `/_\G``=/+\-H+T(d(/_\G))/((dT)_P)` `((dE_(cell))/(dT))_P` is known as temperture coefficient of the e.m.f of the cell. Calculate `/_\S` for the given cell reaction in Q. no. 2:
A
-73.53J/Kmol
B
83.53J/Kmol
C
100J/Kmol
D
None of these
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The correct Answer is:
A
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The cell potential (E_("cell")) of a reaction is related as DeltaG = -nFE_("cell") , where DeltaG represents max. useful electrical work . n=no. of moles of electrons exchanged during the reactino of reversible cell reaction d(DeltaG) = (DeltaV)dP-(DeltaS).dT at constant pressure d(DeltaG) = - (DeltaS).dT :' At constant pressure DeltaG = DeltaG = DeltaH-TDeltaS .......(1) :. DeltaG = DeltaH + T((d(DeltaG))/(dT))_P ......... (B) ((dE_("cell"))/(dT))_(P) is known as temperature coefficient of the e.m.f of the cell When DeltaS increases, temperature coefficient of the emf of cell
DeltaG = DeltaH-TdeltaS and DeltaG = DeltaH + T[(d(DeltaG))/(dT)] " then " ((dE_("cell"))/(dT)) is
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