Assume 3 molecules of fe react according to the following equation. 3fe + 4h2o fe3o4 + 4h2 how many molecules of h2 are produced? how many water molecules are required? what is the mole ratio of fe to h2o? how many hydrogen molecules (h2) are involved in this reaction?

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

The excretory system,need answers for all: )