How do i determine whether a reaction occurs spontaneously

[afcwestwarrior]

how do you determine this, do you hve to take exothermic or endothermic reactions into acount or what

 

[afcwestwarrior]

well I've anshttp://www.csun.edu/~psk17793/G%20Chemistry/spontaneous_processes.htmwered the question myself, and if u need help here's a link

 

[mrjeffy321]

Spontaneous processes result in the lowering of the total Gibbs Free Energy (G).

For a chemical reaction to be spontaneous, ΔG must be negative.
It is possible to have both exothermic (ΔH < 0) as well as endothermic (ΔH > 0) spontaneous reactions.

ΔG = ΔH – T * ΔS
Where ΔG is the change in the Gibbs Free Energy, ΔH is the change in enthalpy, ΔS is the change in entropy, and T is the temperature the reaction occurs at (in Kelvin).