Properties of sulfur trioxide
Thermophysical properties for sulfur trioxide (CAS: 7446-11-9). Use the selector below to view properties in different unit systems.
Calculation Conditions
The following state-dependent properties were calculated at these standard conditions.
Temperature
25 °C
Pressure
1.01325 bar
Need properties at a different state? Use our interactive calculator.
Open CalculatorIdentification
- AtomsO: 3, S: 1
- CAS7446-11-9
- FormulaO3S
- ID7446-11-9
- InChIO3S/c1-4(2)3
- InChI KeyAKEJUJNQAAGONA-UHFFFAOYSA-N
- IUPAC Namesulfur trioxide
- Molecular Weight (kg)80.0632
- Phases
- PubChem ID2.4682e+4
- SMILESO=S(=O)=O
- Synonyms
Physical Properties
- Acentric factor0.4121
- Critical pressure (bar)82.0733
- Critical temperature (°C)217.85
- Critical volume (m³/kmol)0.13
- Dipole moment0
- Melting temperature (°C)28.175
- Normal boiling temperature (°C)44.5
State-dependent Properties
- API gravity-58.6687
- Compressibility factor0.00154622
- Density (kg/m³)2116.45
- Dynamic viscosity (cP)0
- Enthalpy of vaporization (mass) (kJ)540.48
- Enthalpy of vaporization (molar) (kJ/kmol)4.3273e+4
- Gibbs free energy (kJ/kmol)0
- Joule–Thomson coefficient
- Kinematic viscosity
- Molar enthalpy (kJ/kmol)0
- Molar entropy (kJ/(kmol·K))0
- Molar heat capacity (kJ/(kmol·K))39.3569
- Molar volume (m³/kmol)0.037829
- Parachor1.7984e-5
- Poynting correction factor1.00113
- Prandtl number
- Saturation pressure (bar)0.350304
- Saturation temperature (°C)44.5494
- Solubility parameter3.1131e+4
- Specific enthalpy (kJ)0
- Specific entropy (kJ/kg·K)0
- Specific gravity2.11854
- Specific heat capacity (kJ/kg·K)0.491573
- Surface tension0.0330908
- Thermal conductivity
- Thermal diffusivity
Safety Properties
- Autoignition temperature (°C)-273.15
- Flash point temperature (°C)-273.15
- Lower flammability limit-0.197957
- Upper flammability limit0.245076
Environmental Properties
- Global warming potential
- Ozone depletion potential