Heat of reaction in an electrochemical cell : Let n Faraday charge flows out of the cell of emf E,
- ΔG = nFE .......(i)
The Gibbs - Helmholtz equation from the thermodynamics can be given as
.......(ii)
From equation (i) and (ii) we get,
where 
= Temperature coefficient of cell
Case I: When 
= 0, then ΔH = -nFE
Case II: When 
, then nFE > ΔH i.e. process inside the cell is endothermic.
Case III: When 
< 0, then nFE < ΔH i.e., process inside the cell is exothermic.
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