Question

The emf of a chemical cell is positive when free energy change of reaction

Answer 1

Answer:

less than 0

Explanation:

the ans of this Q is

less than 0,

$< 0$

as here chemical cell has positive emf,

so energy change or free energy is less than 0.

Answer 2

The emf of a chemical cell is positive when free energy change of reaction is negative.

Explanation:

The standard emf of a cell is related to Gibbs free energy by following relation:

$\Delta G=-nFE^0$

$\Delta G$ = gibbs free energy

n= no of electrons gained or lost

F= faraday's constant

$E^0$ = standard emf

Thus when $E^0$ = standard emf = +ve

$\Delta G=(-ve)(+ve)$

$\Delta G=-ve$

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