[Mike Dacre]

I think I already know the answer to this, but I can't find an easy reliable source online.

Does K_P predict reaction direction in the same way as K_C? i.e. If K_P is greater than 1, the reaction favors the products, and if it is less than 1 it favors the reactants?

Or is it just that if K_P is greater than 1, the volume of the products is greater, and if it is less, the volume of the reactants is greater? I can imagine there are cases where the volume is not in the same direction as the concentration, particularly in heterogenous reactions.

Thanks for the *delete me* :-)

[Hunter2]

Hier the mathematics for it.

http://bilbo.chm.uri.edu/CHM112/lectures/KpKc.htm

The volumes are depending on the space and pressure. It has nothing to do.