Derivation of the Equilibrium Constant

by gsingh2011
Tags: constant, derivation, equilibrium
 P: 113 I'm trying to understand this: http://en.wikipedia.org/wiki/Equilib...bs_Free_Energy And there are few steps that I don't get. My first question is probably a stupid one, but where does the $$\Sigma$$v$$_{j}$$A$$_{j}$$=0 come from? What exactly is it summing up, the number of atoms? Are you assuming that the products side is negative? (Because I don't see how else you would get zero) And why does it only go up to n? I'll ask my other questions after I get some replies because it's possible I'll figure them out after I read the replies.
 Quote by gsingh2011 where does the $$\Sigma$$v$$_{j}$$A$$_{j}$$=0 come from? What exactly is it summing up, the number of atoms? Are you assuming that the products side is negative? (Because I don't see how else you would get zero) And why does it only go up to n?