The limiting reactant will be Fe.
<h3>What are limiting reactants?</h3>
They are reactants that are available in limited quantities, as compared to other reactants, during the course of reactions.
From the equation of the reaction: 
The mole ratio of Fe to O2 is 4:3.
Thus, for 0.25 mol Fe, 0.25 x 3/4 = 0.1875 mol of O2 is required.
With 0.5 mol of O2 available, it means oxygen is in excess while Fe is limited in availability.
More on limiting reactants can be found here: brainly.com/question/14225536
#SPJ1