Which is the balanced equation for S8 + O2 → SO2?

The reactant S₈ has 8 sulfur atoms, so the product must contain 8 SO₂ molecules to balance sulfur. Those 8 molecules contain 16 oxygen atoms, which requires 8 O₂ molecules on the reactant side. Thus the balanced equation is S₈ + 8O₂ → 8SO₂, choice D.

AI-written and checked against the verified answer.