Balance the following reactions:

Explanation:

A balanced reaction has the number of atoms on the right-hand side of the reaction = the number of atoms on the left-hand side of the reaction

Multiply Fe with 3 and H₂O with 4 and then H₂ with 4

Final Answer:

3Fe (s) + 4H₂O (l) → Fe₃O₄ (s) + 4H₂ (g) ↑