Gibbs Free Energy calculation

[504939134]

Will we only be using the Gibbs change in free energy equation? And when do we know to use it instead of just G=H-TS?

[Eesha Sohail 1D]

It depends on the values/units you are given in the question. If reaction constant is given (which, probably not) then you will most likely use the other equation. However, the G = H-TS equation is definitely the most important one.

[Alison Trinh 1E]

Why do we need to use the concept of Gibbs Free Energy?

[Ashley Fang 2G]

We need to know the concept of Gibbs free energy because it tells us whether a reaction will be spontaneous or not.
If delta G is negative, the reaction is spontaneous, and the products will have less free energy than the reactants.
If delta G is positive, the reaction is NOT spontaneous, and the products will have more free energy than the reactants.