Lithium sulfide
| Names | |
|---|---|
| IUPAC name
Lithium hydrosulfide | |
| Preferred IUPAC name
Lithium sulfide | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.032.013 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| Li2S | |
| Molar mass | 45.95 g/mol |
| Appearance | white solid |
| Density | 1.67 g/cm3 |
| Melting point | 938 °C (1,720 °F; 1,211 K) |
| Boiling point | 1,372 °C (2,502 °F; 1,645 K) |
| decomposes to LiOH and H2S | |
| Solubility | very soluble in ethanol |
| Structure | |
| Antifluorite (cubic), cF12 | |
| Fm3m, No. 225 | |
| Tetrahedral (Li+); cubic (S2−) | |
| Thermochemistry | |
Std molar entropy (S⦵298) |
63 J/mol K |
Std enthalpy of formation (ΔfH⦵298) |
−9.401 kJ/g or −447 kJ/mol |
| Hazards | |
| NFPA 704 (fire diamond) | |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
240 mg/kg (oral, rat) |
| Safety data sheet (SDS) | External MSDS |
| Related compounds | |
Other anions |
Lithium oxide Lithium selenide Lithium telluride Lithium polonide |
Other cations |
Sodium sulfide Potassium sulfide Rubidium sulfide Caesium sulfide |
Related compounds |
Lithium hydrosulfide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Lithium sulfide is the inorganic compound with the formula Li2S. It crystallizes in the antifluorite motif, described as the salt (Li+)2S2−. It forms a solid yellow-white deliquescent powder. In air, it easily hydrolyses to release foul smelling hydrogen sulfide gas.