1. Balanced Chemical Equation:

The reaction between iron oxide (Fe₂O₃) and aluminum (Al) is a classic thermite reaction:

Fe₂O₃ + 2 Al → 2 Fe + Al₂O₃

2. Mole Ratio:

From the balanced equation, we see that 1 mole of Fe₂O₃ reacts with 2 moles of Al.

3. Calculation:

* We have 2.5 moles of Al.

* To find the moles of Fe₂O₃ needed, we use the mole ratio:

(2.5 mol Al) * (1 mol Fe₂O₃ / 2 mol Al) = 1.25 mol Fe₂O₃

Answer: You would need 1.25 moles of iron oxide (Fe₂O₃) to react completely with 2.5 moles of aluminum (Al).