[nosaj]

In Honors Chemistry, we learned that for a reaction aA+bB cC+dD, the equilibrium constant is

[tex]K_{eq}=\frac{[C]^c [D]^d}{[A]^a[ B]^b}[/tex]

Could someone help me understand why this formula is true? Thanks!

[Borek]

Depends on what you know about thermodynamics - it can be relatively easily derived from ΔG considerations, but if you have never heard about the free energy such a derivation won't do you much good.

[nosaj]

We did learn about ΔG in class. For example, I know that [itex]\Delta G = \Delta H - T \Delta S[/itex].

[Borek]

http://en.wikipedia.org/wiki/Chemical_equilibrium#Thermodynamics