Question

4 FeS₂ + 11 0₂ → 2 Fe₂O3 + 8 SO₂

How many moles of O2 are required to react completely with 10.5 moles of FeS2

Answer 1

From the equation, we see that for every 4 moles of pyrite consumed, 11 moles of oxygen are consumed.

So, the answer is (10.5/4)(11) = 28.875 mol