The cell potential (Ecell) of a reaction is related as ΔG=−nFEcell , where ΔG represents max. useful electrical work n = no. of moles of electrons exchanged during the reactionfor reversible cell reaction d(ΔG)=ΔrVdp−ΔrS⋅dTat constant pressure d(ΔG)=−ΔrS⋅dT ∵ At constant pressure ΔG=ΔH−T⋅ΔS . . . . (1)∴ ΔG=ΔH+Td(ΔG)dTp . . . . .(2)dEcell dTp is known as temperature coefficient of the e.m.f of the cell The temperature coefficient of the e.m.f. of cell, dEdT is given by : At 300K,ΔH for the reaction Zn(s)+AgCl(s)⟶ZnCl2(aq)+2Ag(s) is −218kJ/mol while the e.m.f. of the cell was 1.015V⋅dEdTp of the cell is: Calculate ΔS for the given cell reaction in Zn(s)+AgCl(s)⟶ZnCl2(aq)+2Ag(s) is −218kJ/mol while the e.m.f. of the cell was 1.015V⋅dEdTp of the cell is:
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