Input interpretation
gray selenium
Chemical names and formulas
formula | Se name | gray selenium IUPAC name | selenium alternate names | crystalline hexagonal selenium | selenium gray | selenium homopolymer mass fractions | Se (selenium) 100%
Structure diagram
Structure diagram
Basic properties
molar mass | 78.971 g/mol phase | solid (at STP) melting point | 217 °C boiling point | 684.9 °C density | 4.81 g/cm^3 solubility in water | insoluble particle size | 2 mm
Solid properties (at STP)
density | 4.81 g/cm^3 vapor pressure | 0.0071 mmHg (at 25 °C) refractive index | 1.000895
Units
Thermodynamic properties
specific heat capacity c_p | gas | 0.2634 J/(g K) | solid | 0.3216 J/(g K) molar heat capacity c_p | gas | 20.8 J/(mol K) | solid | 25.4 J/(mol K) specific free energy of formation Δ_fG° | gas | 2.368 kJ/g molar free energy of formation Δ_fG° | gas | 187 kJ/mol specific heat of formation Δ_fH° | gas | 2.876 kJ/g | solid | 0 kJ/g molar heat of formation Δ_fH° | gas | 227.1 kJ/mol | solid | 0 kJ/mol specific entropy S° | gas | 2.238 J/(g K) | solid | 0.5369 J/(g K) molar entropy S° | gas | 176.7 J/(mol K) | solid | 42.4 J/(mol K) molar heat of vaporization | 95.48 kJ/mol | specific heat of vaporization | 1.209 kJ/g | molar heat of fusion | 6.69 kJ/mol | specific heat of fusion | 0.0847 kJ/g | critical temperature | 1766 K | critical pressure | 27.2 MPa | (at STP)
Chemical identifiers
![CAS number | 7782-49-2 PubChem CID number | 6326970 PubChem SID number | 24852251 SMILES identifier | [Se] InChI identifier | InChI=1/Se RTECS number | VS7700000 MDL number | MFCD00134090](../image_source/28de86e22ca3a5a65ca4cf0243726168.png)
CAS number | 7782-49-2 PubChem CID number | 6326970 PubChem SID number | 24852251 SMILES identifier | [Se] InChI identifier | InChI=1/Se RTECS number | VS7700000 MDL number | MFCD00134090
NFPA label
NFPA label
NFPA health rating | 2 NFPA fire rating | 0 NFPA reactivity rating | 0
Toxicity properties
RTECS classes | tumorigen | reproductive effector