Consider the equation 4 fe+3 o2 → 2 fe2o3 . in this equation, 3 o2 is a

Explanation:

While writing a chemical reaction equation, the number of atoms or molecules written on left hand side represent reactants. Whereas the number of atoms or molecules written on right hand side represent products.

For example, in the given equation, .

Here, 4 Fe and 3 are on the left hand side and thus these are the reactants. On the other hand, 2 is written on right hand side and thus it is the product.

Therefore, we can conclude that in this equation, 3 O2 is a reactant.

first one is the correct answer