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Can E("cell")^(@) or Delta r G ^(@) for ...

Can `E_("cell")^(@)` or `Delta r G ^(@)` for cell reaction ever be equal to zero?

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No, otherwise the reaction become non-feasible. The reaction is feasible only at
`E_("cell")^(@)` = positive or `Delta _(r ) G^(@)` = negative.
When `E^(@) = Delta _(r ) G^(@) = 0`, the reaction reaches at equilibrium.
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