At 900 degrees C, Kc for the reaction is 5.1. if .050 mole of H20 and .100 mole of Fe are placed in a 1L container at 900 degrees C, how many grams of Fe3O4 are present at equilibrium?

2 answers

What reaction? You didn't post that. I think you omitted anything about hydrogen being evolved.
3 Fe + 4H2O= Fe3O4 + 4H2