Manganese dioxide
_oxide.jpg) |
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| Names | |
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IUPAC names
Manganese oxide
Manganese(IV) oxide |
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| Other names
Pyrolusite, hyperoxide of manganese, black oxide of manganese
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| Identifiers | |
1313-13-9 
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| 3D model (Jmol) | Interactive image |
| ChemSpider |
14117
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| ECHA InfoCard | 100.013.821 |
| EC Number | 215-202-6 |
| PubChem | 14801 |
| RTECS number | OP0350000 |
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| Properties | |
| MnO 2 |
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| Molar mass | 86.9368 g/mol |
| Appearance | Brown-black solid |
| Density | 5.026 g/cm3 |
| Melting point | 535 °C (995 °F; 808 K) (decomposes) |
| insoluble | |
| +2280.0·10−6 cm3/mol | |
| Thermochemistry | |
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Std molar
entropy (S |
53 J·mol−1·K−1 |
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Std enthalpy of
formation (ΔfH |
−520 kJ·mol−1 |
| Hazards | |
| Safety data sheet | ICSC 0175 |
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EU classification (DSD)
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Harmful (Xn) Oxidizer (O) |
| R-phrases | R20/22 |
| S-phrases | (S2), S25 |
| NFPA 704 | |
| Flash point | 535 °C (995 °F; 808 K) |
| Related compounds | |
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Other anions
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Manganese disulfide |
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Other cations
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Technetium dioxide Rhenium dioxide |
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Manganese(II) oxide Manganese(II,III) oxide Manganese(III) oxide Manganese heptoxide |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is  ?) |
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| Infobox references | |
Manganese(IV) oxide is the inorganic compound with the formula MnO
2. This blackish or brown solid occurs naturally as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules. The principal use for MnO
2 is for dry-cell batteries, such as the alkaline battery and the zinc-carbon battery.MnO
2 is also used as a pigment and as a precursor to other manganese compounds, such as KMnO
4. It is used as a reagent in organic synthesis, for example, for the oxidation of allylic alcohols. MnO
2 in the α polymorph can incorporate a variety of atoms (as well as water molecules) in the "tunnels" or "channels" between the magnesium oxide octahedra. There is considerable interest in α-MnO
2 as a possible cathode for lithium ion batteries.
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Wikipedia