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To balance the oxygen atoms in Fe + H2O -> Fe3O4 + H2, what coefficient must be placed before H2O?

Question
To balance the oxygen atoms in Fe + H2O -> Fe3O4 + H2, what coefficient must be placed before H2O?
2
3
4
6
Answer
4
Detailed Explanation
Fe3O4 has 4 oxygen atoms on the RHS, so 4 H2O molecules are needed on the LHS to supply 4 oxygen atoms.
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