Gibbs Free Energy of Reaction - Practice Questions & MCQ

Let n faraday charge be involved in a cell generating an emf E, then the magnitude of the work done by the cell will be calculated as:
|Work| = Charge × Potential = 

Now, the maximum work that can be extracted from the cell is equal to the decrease in the Gibb's free energy.

So, it can be said that

The negative sign is incorporated to include the spontaineity relation between E and Gibb's free Energy

Similarly, maximum obtainable work from the cell at standard condition will be:

Thus, for a spontaneous cell reaction, 

E > 0 and G < 0