## Gibbs Free Energy of Formation

$\Delta G^{\circ} = -nFE_{cell}^{\circ}$

Cindy Chen_2I
Posts: 43
Joined: Wed Nov 18, 2015 3:00 am

### Gibbs Free Energy of Formation

In home work problem 14.33, they told us that the standard gibbs free energy of formation of Tl3+ is 215 kJ/mol. Why is the formation reaction Tl3+ + 3e- --> Tl and not the other way around? How would you know this?

Victoria Ford 4D
Posts: 65
Joined: Fri Sep 25, 2015 3:00 am

### Re: Gibbs Free Energy of Formation

Standard potentials are calculated using the reduction potentials (being standard) which is why they used the gain of electrons equation.