Formation of Sulfur Trioxide
2SO2 + O2 → 2SO3
Overview
Sulfur dioxide reacts with oxygen to form sulfur trioxide in the Contact Process. This reversible reaction requires a vanadium pentoxide catalyst and temperatures around 400-450 C. It is the key step in sulfuric acid manufacturing.
Participants
| Role | Substance | Coefficient | State |
|---|---|---|---|
| Reactant | Oxygen O | 1 | (g) |
| Reactant | Sulfur Dioxide SO₂ | 2 | (g) |
| Product | Sulfur Trioxide SO₃ | 2 | (g) |
Everyday Example
This reaction occurring in the atmosphere from volcanic emissions or industrial pollution contributes to acid rain formation.
Industrial Importance
The Contact Process is the primary industrial method for producing sulfuric acid, the world's most produced chemical. Over 260 million tonnes of sulfuric acid are made annually using this reaction.
Properties
- Type
- Synthesis
- Reversible
- Yes
- Energy
- Exothermic
- ΔH
- -198.2 kJ/mol
- Catalyst
- Vanadium(V) oxide (V₂O₅)
Related Reactions
Fischer-Tropsch Synthesis (General)
Formation of Aluminum Oxide
Formation of Ammonia (Haber Process)
Formation of Barium Oxide
Formation of Barium Sulfate
Formation of Beryllium Oxide
Formation of Cadmium Oxide
Formation of Calcium Carbonate from Oxides
Formation of Calcium Hydroxide
Formation of Calcium Oxide (Quicklime)
Frequently Asked Questions
What is the equation for Formation of Sulfur Trioxide?
The balanced equation is: 2SO₂ + O₂ → 2SO₃.
What type of reaction is Formation of Sulfur Trioxide?
Formation of Sulfur Trioxide is a synthesis reaction. It is reversible under certain conditions.
Is Formation of Sulfur Trioxide exothermic or endothermic?
Formation of Sulfur Trioxide is exothermic (releases energy). The enthalpy change (ΔH) is -198.2 kJ/mol.
What conditions are needed for Formation of Sulfur Trioxide?
This reaction requires a catalyst (Vanadium(V) oxide (V₂O₅)).