Sulfur Trioxide

SO₃

IUPAC: Sulfur trioxide

CAS: 7446-11-9

Overview

Sulfur trioxide is a key intermediate in sulfuric acid production via the contact process. It reacts vigorously with water.

Composition

Element Symbol Atoms Atomic Mass
Oxygen O 3 15.9990
Sulfur S 1 32.0600

Elemental Composition

O
Oxygen ×3
60.0%
S
Sulfur ×1
40.0%

Uses

  • • Sulfuric acid production
  • • Sulfonation agent

Fun Facts

  • ✦ SO₃ exists in three solid forms: α, β, and γ polymorphs

Safety

  • ⚠ Corrosive
  • ⚠ Reacts violently with water
  • ⚠ Toxic

Structure

SMILES

O=S(=O)=O

Properties

Type
oxide
State
liquid
Molar Mass
80.06 g/mol
Density
1.9200 g/cm³
Melting Point
16.9 °C
Boiling Point
45.0 °C
Solubility
Reacts violently

Molecular Descriptors

Exact Mass
79.9568
XLogP
-0.5
TPSA
52.2 Ų
H-Bond Donors
0
H-Bond Acceptors
3
Rotatable Bonds
0
Heavy Atoms
4
Complexity
61.0

Related Compounds

Aluminum Oxide

Al₂O₃

Antimony Trioxide

Sb₂O₃

Barium Oxide

BaO

Beryllium Oxide

BeO

Bismuth(III) Oxide

Bi₂O₃

Boron Trioxide

B₂O₃

Cadmium Oxide

CdO

Calcium Oxide

CaO

Carbon Dioxide

CO₂

Carbon Monoxide

CO

Frequently Asked Questions

What is Sulfur Trioxide?
Sulfur Trioxide (SO₃) is a oxide compound with the IUPAC name Sulfur trioxide.
What is the molecular weight of Sulfur Trioxide?
Sulfur Trioxide has a molar mass of 80.06 g/mol.
What state is Sulfur Trioxide at room temperature?
Sulfur Trioxide is a liquid at room temperature.
Is Sulfur Trioxide organic or inorganic?
Sulfur Trioxide is classified as an inorganic compound.
What elements make up Sulfur Trioxide?
Sulfur Trioxide (SO₃) is composed of Oxygen (O), Sulfur (S).