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Chemical compound From Wikipedia, the free encyclopedia
Rhodium(IV) oxide (or rhodium dioxide) is the chemical compound with the formula RhO2.
Identifiers | |
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3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.032.021 |
EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |
RhO2 | |
Molar mass | 134.904 g/mol |
Appearance | black crystalline solid |
Density | 7.2 g/cm3 |
Melting point | 1,050 °C (1,920 °F; 1,320 K) (decomposes) |
Solubility | insoluble in aqua regia |
Structure | |
tetragonal (rutile) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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RhO2 is highly insoluble even in hot aqua regia.[1]
RhO2 has the tetragonal rutile structure.[2]
RhO2 has metallic resistivity with values <10−4 Ohm·cm. It transforms in air to Rh2O3 at 850 °C and then to metal and oxygen at 1050 °C.[2]
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