SULFUR TRIOXIDE - (7446-11-9)

Introduction

Name: sulfur trioxide
* IUPAC
CAS Number: 7446-11-9
Chemical Formula: SO3
Molar Mass: 80.0632 g
Mass Percent: S 40.049 %; O 59.950 % 

Classification

• inorganic

Uses/Function

• "Another way to dispose of the SO2 is to oxidize it to SO3. The SO3 can then be converted to sulfuric acid, which is then sold." 1

Bonding

Double Bonds: 1
Triple Bonds: 0
Sigma Bonds: 3
Pi Bonds: 1
Total: 4
Carboxyl Groups: 0
Hydroxyl Groups: 0
Geometry: trigonal planar
Hybridization: sp2
Bonding: polar covalent
Ionic Character: 26.06 %

Thermochemistry

ΔHf° (s beta): -108.63 kcal/mol 2 = -454.51 kJ/mol
ΔHf° (ℓ): -105.41 kcal/mol 2 = -441.04 kJ/mol
ΔHf° (g): -94.58 kcal/mol 2 = -395.72 kJ/mol
S° (s beta): 12.5 cal/(mol•K) 3 = 52.30 J/(mol•K)
S° (ℓ): 22.85 cal/(mol•K) 3 = 95.60 J/(mol•K)
S° (g): 61.34 cal/(mol•K) 3 = 256.65 J/(mol•K)
ΔGf° (s beta): -88.19 kcal/mol 4 = -368.99 kJ/mol
ΔGf° (ℓ): -88.04 kcal/mol 4 = -368.36 kJ/mol
ΔGf° (g): -88.69 kcal/mol 4 = -371.08 kJ/mol

Reactions

For More Information

Sources

(1) - Brady, James E. and Senese, Fred. Chemistry: Matter and Changes, 4th ed.; John Wiley and Sons: Hoboken, New Jersey, 2004; p 1013.
(2) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(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) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(5) - Ebbing, Darrell D. General Chemistry 3rd ed.; Houghton Mifflin Company: Boston, MA, 1990; p 205.
(6) - Ebbing, Darrell D. General Chemistry 3rd ed.; Houghton Mifflin Company: Boston, MA, 1990; p 217.