Manganese dioxide
Manganese dioxide, also known as manganese(IV) oxide, is a chemical compound of manganese and oxygen. It contains manganese in the +4 oxidation state. Its chemical formula is MnO2. It is black and powdery. It is used as a depolarizer in alkaline batteries and Leclanche batteries. It is found naturally as the mineral pyrolusite.
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| IUPAC names
Manganese oxide Manganese(IV) oxide | |
| Other names
Pyrolusite, hyperoxide of manganese, black oxide of manganese, manganic oxide | |
| Identifiers | |
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| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.013.821 |
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| Properties | |
| MnO 2 | |
| 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 | |
| Std enthalpy of formation ΔfH |
−520 kJ·mol−1[1] |
| Standard molar entropy S |
53 J·mol−1·K−1[1] |
| Hazards | |
| EU classification | Harmful (Xn) Oxidizer (O) |
| NFPA 704 |
1
1
2
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| R-phrases | R20/22 |
| S-phrases | (S2), S25 |
| Related compounds | |
| Other anions | Manganese disulfide |
| Other cations | Technetium dioxide Rhenium dioxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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| Infobox references | |
Related pages
References
- Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22. ISBN 978-0-618-94690-7.
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