Answer :

Balanced equation: 3Fe + 4H2O Fe3O4 + 4H2


Step 1: Write the unbalanced equation


Fe + H2O Fe3O4 + H2


Step 2: Compare the number of atoms of reactants with the number of atoms of products.



Step 3: Now, first we consider the element having unequal no. of atoms on both sides. Thus, first let us consider Fe atom. If we multiply 3 in the reactant (in Fe), we will get the equal number of atoms as in product (in Fe3O4)



Step 4: Write the resulting equation:


3Fe + H2O Fe3O4 + H2


Step 5: Now check whether the equation is balanced or not by comparing the atoms



We find that the equation is not balanced yet. As the number of oxygen atoms is unequal on the two sides. Hence, balance the oxygen atom.


Step 6: If we multiply 4 in the reactant (in H2O), we will get the equal number of oxygen atoms on both sides.



Step 7: Write the resulting equation:


3Fe + 4H2O Fe3O4 + H2


Step 8: Now check whether the equation is balanced or not by comparing the atoms.



We find that the equation is not balanced yet. As the number of hydrogen atoms is unequal on the two sides.


Step 9: Now, we consider hydrogen atoms. If we multiply 2 in the product (in H2), we will get the equal number of hydrogen atoms as in reactants.



Step 10: Write the resulting equation:


3Fe + 4H2O Fe3O4 + 2H2


We find that the equation is balanced now.


Step 11: Write down the final balanced equation:


3Fe + 4H2O Fe3O4 + 2H2


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