Oleum is sulfuric acid that holds dissolved SO₃. A bottle of oleum is labelled 109%, which means that 100 g of it gives 109 g of pure H₂SO₄ when enough water is added. What is the mass percentage of free SO₃ in this oleum? Atomic masses in g mol⁻¹: H 1.0, O 16.0, S 32.0.

ChemistryAdvancedHigh School (11–12)Atoms and Molecules › The Mole Concept Olympiad

Oleum is sulfuric acid that holds dissolved $\text{SO}_3$ . A bottle of oleum is labelled $109\%$ , which means that $100\ \text{g}$ of it gives $109\ \text{g}$ of pure $\text{H}_2\text{SO}_4$ when enough water is added. What is the mass percentage of free $\text{SO}_3$ in this oleum? Atomic masses in $\text{g mol}^{-1}$ : H 1.0, O 16.0, S 32.0.

← All Quizzes

← A solution contains oxalic acid, H₂C₂O₄, and sodium hydrogen oxalate, NaHC₂O₄. A 25.0 mL portion needs 20.0 mL of 0.100 mol L⁻¹ NaOH to reach the phenolphthalein end point. A second 25.0 mL portion, in acid, needs 16.0 mL of 0.0400 mol L⁻¹ KMnO₄, where 2 MnO₄⁻ + 5 C₂O₄²⁻ + 16 H⁺ → 2 Mn²⁺ + 10 CO₂ + 8 H₂O. What is the molarity of NaHC₂O₄ in the solution?In the Kjeldahl method, the nitrogen in 0.700 g of a food is changed to ammonia, which is passed into 50.0 mL of 0.100 mol L⁻¹ sulfuric acid. The acid that is not neutralised needs 20.0 mL of 0.100 mol L⁻¹ NaOH for complete neutralisation. What is the percentage of nitrogen in the food by mass? Atomic masses in g mol⁻¹: H 1.0, N 14.0, S 32.0. →

More onAtoms and Molecules › The Mole Concept

Discussion (0)

Loading…

Discussion (0)

Problems on this topic