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?

How many molecules of H2 are produced?: 4 molecules

How many water molecules are required?: 4 molecules

What is the mole ratio of Fe to H2O?: 3/4

How many hydrogen molecules (H2) are involved in this reaction?: 4 molecules

Chemical reaction: 3Fe + 4H₂O → Fe₃O₄ + 4H₂.

From chemical reaction:

1) n (Fe) : n (H ₂) = 3 : 4.

Four molecules of hydrogen are produced.

2) n (Fe) : n (H₂O) = 3 : 4.

Four molecules of water are required, because the mole ratio of Fe to H₂O is 3:4.

3) Hydrogen molecules are not involved in this reaction, but produced (4 molecules).