Hydrogen sulfide |
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Other names | - Dihydrogen monosulfide
- Dihydrogen sulfide
- Sewer gas
- Sulfane
- Sulfurated hydrogen
- Sulfureted hydrogen
- Sulfuretted hydrogen
- Sulfur hydride
- Hydrosulfuric acid
- Hydrothionic acid
- Thiohydroxic acid
- Sulfhydric acid
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Identifiers |
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CAS number | 7783-06-4 |
PubChem | 402 |
EC number | 231-977-3 |
KEGG | C00283 |
MeSH | Hydrogen+sulfide |
ChEBI | CHEBI:16136 |
RTECS number | MX1225000 |
SMILES | [H]S[H] |
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Beilstein Reference | 3535004 |
Gmelin Reference | 303 |
3DMet | B01206 |
Properties |
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Molecular formula | H2S |
Molar mass | 34.08 g mol-1 |
Appearance | Colorless gas |
Odor | Rotten eggs |
Density | 1.363 g dm−3 |
Melting point | −82 °C, 191 K, -116 °F |
Boiling point | |
Solubility in water | 4 g dm−3 (at 20 °C) |
Vapor pressure | 1740 kPa (at 21 °C) |
Acidity (pKa) | 7.0 |
| −25.5·10−6 cm3/mol |
Refractive index (nD) | 1.000644 (0 °C) |
Structure |
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| C2v |
Molecular shape | Bent |
Dipole moment | 0.97 D |
Thermochemistry |
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Std enthalpy of formation ΔfHo298 | −21 kJ mol−1 |
Standard molar entropy So298 | 206 J mol−1 K−1 |
Specific heat capacity, C | 1.003 J K−1 g−1 |
Hazards |
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EU classification | F+ T+ N |
Main hazards | Flammable and highly toxic |
NFPA 704 | |
R-phrases | R12, R26, R50 |
S-phrases | (S1/2), S9, S16, S36, S38, S45, S61 |
Explosive limits | 4.3–46% |
U.S. Permissible exposure limit (PEL) | C 20 ppm; 50 ppm [10-minute maximum peak] |
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |