Manganese(II,III) oxide
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Manganese(II,III) oxide is the chemical compound with formula Mn3O4. Manganese is present in two oxidation states +2 and +3 and the formula is sometimes written as MnO·Mn2O3. Mn3O4 is found in nature as the mineral hausmannite.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
manganese(II) dimanganese(III) oxide | |
Other names
Manganese tetroxide; Manganese oxide, Manganomanganic oxide, Trimanganese tetraoxide, Trimanganese tetroxide[1] | |
Identifiers | |
3D model (JSmol) |
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ECHA InfoCard | 100.013.879 |
PubChem CID |
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RTECS number |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
Mn3O4 MnO·Mn2O3 | |
Molar mass | 228.812 g/mol |
Appearance | brownish-black powder[1] |
Density | 4.86 g/cm3 |
Melting point | 1,567 °C (2,853 °F; 1,840 K) |
Boiling point | 2,847 °C (5,157 °F; 3,120 K) |
insoluble | |
Solubility | soluble in HCl |
+12,400·10−6 cm3/mol | |
Structure | |
Spinel (tetragonal), tI28 | |
I41/amd, No. 141 | |
Hazards | |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
C 5 mg/m3[1] |
REL (Recommended) |
None established[1] |
IDLH (Immediate danger) |
N.D.[1] |
Thermochemistry | |
Std molar entropy (S⦵298) |
149 J·mol−1·K−1[2] |
Std enthalpy of formation (ΔfH⦵298) |
−1387 kJ·mol−1[2] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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