Tungsten Trioxide

WO₃

IUPAC: Tungsten(VI) oxide

CAS: 1314-35-8

Overview

Tungsten trioxide is a yellow powder that is the primary intermediate in tungsten metal production. It is reduced with hydrogen or carbon to produce tungsten metal. It also has photochromic and electrochromic properties, changing color when exposed to light or electric fields.

Composition

Element Symbol Atoms Atomic Mass
Oxygen O 3 15.9990
Tungsten W 1 183.8400

Elemental Composition

O
Oxygen ×3
20.7%
W
Tungsten ×1
79.3%

Uses

  • • Tungsten metal production
  • • Electrochromic smart windows
  • • Catalyst
  • • Yellow ceramic pigment

Fun Facts

  • ✦ Electrochromic smart windows using WO₃ can darken or lighten with an applied voltage

Safety

  • ⚠ Low toxicity
  • ⚠ Dust inhalation should be avoided

Structure

SMILES

O=[W](=O)=O

Properties

Type
oxide
State
solid
Molar Mass
231.84 g/mol
Density
7.1600 g/cm³
Melting Point
1473.0 °C
Boiling Point
1700.0 °C
Solubility
insoluble

Molecular Descriptors

Exact Mass
231.9357
TPSA
51.2 Ų
H-Bond Donors
0
H-Bond Acceptors
3
Rotatable Bonds
0
Heavy Atoms
4
Complexity
61.0

Also Known As

Tungsten trioxide Tungstic anhydride

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 Tungsten Trioxide?
Tungsten Trioxide (WO₃) is a oxide compound with the IUPAC name Tungsten(VI) oxide.
What is the molecular weight of Tungsten Trioxide?
Tungsten Trioxide has a molar mass of 231.84 g/mol.
What state is Tungsten Trioxide at room temperature?
Tungsten Trioxide is a solid at room temperature.
Is Tungsten Trioxide organic or inorganic?
Tungsten Trioxide is classified as an inorganic compound.
What elements make up Tungsten Trioxide?
Tungsten Trioxide (WO₃) is composed of Oxygen (O), Tungsten (W).