What is the equilibrium expression for: Fe3O4(s) + 4H2(g) <=> 3Fe(s) + 4H2O(g)
Kc =

a)[Fe]3 [H2O]4 / [Fe3O4] [H2]4
b)[Fe3O4] [H2]4 / [Fe]3 [H2O]4
c)[H2O]4 / [H2]4
d)[Fe] [H2O] / [Fe3O4] [H2]

i'm assuming that it's c.) red bank..

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.