The toxic gas hydrogen fluoride, HF, is produced from the double displacement reaction of calcium fluoride, CaF₂, and concentrated sulfuric acid, H₂SO₄. Starting with 10.0g of CaF₂ and 15.0g H₂SO₄, the balanced chemical equation is CaF₂ + H₂SO₄ → 2 HF + CaSO₄. Which is the limiting reactant?