Mercury(I) iodide
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Mercury(I) iodide is a chemical compound of mercury and iodine. The chemical formula is Hg2I2. It is photosensitive and decomposes easily to mercury and HgI2.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Dimercury diiodide | |
Other names
Mercury(I) iodide Mercurous iodide Red mercury | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.035.811 |
EC Number |
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PubChem CID |
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UNII | |
UN number | 1638 |
CompTox Dashboard (EPA) |
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Properties | |
Hg 2I 2 | |
Molar mass | 654.99 g mol−1 |
Appearance | Dark yellow, opaque crystals |
Odor | Odourless |
Density | 7.7 g mL−1 |
Solubility product (Ksp) |
5.2×10−29[1] |
−41.5·10−6 cm3/mol | |
Thermochemistry | |
Std molar entropy (S⦵298) |
241.47 J K−1 mol−1 |
Std enthalpy of formation (ΔfH⦵298) |
−119.09 kJ mol−1 |
Hazards | |
GHS labelling: | |
Danger | |
H300, H310, H330, H373, H410 | |
P260, P273, P280, P284, P301+P310 | |
Related compounds | |
Other anions |
Mercury(I) bromide Mercury(I) chloride Mercury(I) fluoride |
Related compounds |
Mercury(II) iodide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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