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Under what condition is E("cell")^(@)=0 ...

Under what condition is `E_("cell")^(@)=0` or `Delta_(r)G=0`?

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At the stage of chemical equilibr ium in the cell.
`E_("cell")=0`
`Delta_(r)G^(@)=-nFE_("cell")^(@)` ltbr. `=-nxxFxx0=0`
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