Me equalize: fe2o3 + h2 = fe + h2o

Fe₂O₃ + 3H₂ ⟶ 2Fe + 3H₂O

Explanation:

Fe₂O₃ + H₂ ⟶ Fe + H₂O

We could balance this equation by inspection, but I will choose the oxidation number method.

1. Calculate the oxidation number of every atom:

Fe₂⁺³O₃⁻² + H₂⁰ ⟶ Fe⁰ + H₂⁺O²⁻

2. Identify the changes in oxidation number:

Fe: +3 ⟶    0; Change =  -3

H:   0 ⟶   +1; Change =  +1

3. Equalize the changes in oxidation number.

You need 3 atoms of H for every 1 atom of Fe or 6 atoms of H for every 2 atoms of Fe. This gives us total changes of +6 and -6.

4. Insert coefficients to get these numbers.

1Fe₂O₃ + 3H₂ ⟶ 2Fe + 3H₂O

Every formula has a coefficient. The equation should be balanced.

5. Check that all atoms balance.

Atom  Left-hand side  Right-hand side

 Fe               2                           2

 O                3                            3

 H                6                            6

OK.

The balanced equation is

Fe₂O₃ + 3H₂ ⟶ 2Fe + 3H₂O

the temperature of the gas, in k, not celsius.