TUNGSTEN(VI) OXIDE - (1314-35-8)

Introduction

Name: tungsten(VI) oxide; tungsten trioxide
* IUPAC
CAS Number: 1314-35-8
Chemical Formula: WO3
Molar Mass: 231.8382 g
Mass Percent: W 79.296 %; O 20.703 % 

Classification

• inorganic

Uses/Function

• "Manuf[acturing] tungstates which are used for x-ray screens and for fireproofing fabrics." 1

Physical Properties

Melting Point:*
1472°C 2 = 1745.15 K = 2681.6°F

Density (g/cm3):
7.2 at room temperature/pressure 2
* - 1 atm pressure

Solubility

Qualitative:
insoluble:  2
slightly soluble: 2
soluble: 2

Bonding

Bonding: ionic
Ionic Character: 52.73 %

Thermochemistry

ΔHf° (s): -201.46 kcal/mol 3 = -842.91 kJ/mol
ΔHf° (s): -201.46 kcal/mol = -842.9 kJ/mol 4
S° (s): 18.14 cal/(mol•K) 5 = 75.90 J/(mol•K)
S° (s): 18.14 cal/(mol•K) = 75.9 J/(mol•K) 6
ΔGf° (s): -182.63 kcal/mol 7 = -764.12 kJ/mol
ΔGf° (s): -182.60 kcal/mol = -764.0 kJ/mol 8

For More Information

Wikipedia
Journals:
L. A. Bursill, D. J. Smith and Rhonda G. Evans, Proc. R. Soc. A 415, 227-237 (1988)
E. Iguchi and R. J. D. Tilley, Proc. R. Soc. A 286, 55-85 (1977)

Sources

(1) - The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals, 13th ed.; Budavari, S.; O'Neil, M.J.; Smith, A.; Heckelman, P. E.; Kinneary, J. F., Eds.; Merck & Co.: Whitehouse Station, NJ, 2001; entry 9886.
(2) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4-92.
(3) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(4) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 5-23.
(5) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(6) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 5-23.
(7) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(8) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 5-23.