Which substance is the oxidizing agent in this reaction? fe2o3+3co→2fe+3co2 express your answer as a chemical formula?

Equation is as follow,

Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂

Oxidation:

3 CO → 3 CO₂

Oxidation state of C in CO is + 2, and that in CO₂ is + 4. So, carbon has lost 2 electrons per mole and 6 electrons per 3 moles hence,

3 CO → 3 CO₂ + 6 e⁻

Reduction:

Fe₂O₃ → 2 Fe

Oxidation state of Fe in Fe₂O₃ is + 3 per atom, and that in Fe is 0. So, Iron has gained 3 electrons per atom and 6 electrons per 2 atoms hence,

Fe₂O₃ + 6e⁻ → 2 Fe

Result:

Iron in Fe₂O₃ has been reduced in this reaction and has played a role of oxidizing agent by oxidizing carbon from + 2 state to + 4 state.