Which of the following chemical reactions does NOT represent a balanced equation?
3Fe + 4H2O → Fe3O4 + 4H2
4Fe + 3H2O → Fe3O4 + 2H2
Fe + H2O → FeO + H2
2Fe + 3H2O → Fe2O3 + 3H2
B. 4Fe + 3H2O → Fe3O4 + 2H2