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.
| Manganese dioxide | |
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| IUPAC name | Manganese oxide Manganese(IV) oxide |
| Other names | Pyrolusite, hyperoxide of manganese, black oxide of manganese, manganic oxide |
| Identifiers | |
| CAS number | |
| PubChem | |
| EC number | 215-202-6 |
| ChEBI | CHEBI:136511 |
| RTECS number | OP0350000 |
| SMILES | O=[Mn]=O |
| Properties | |
| Molecular formula | MnO2 |
| Molar mass | 86.9368 g/mol |
| Appearance | Brown-black solid |
| Density | 5.026 g/cm3 |
| Melting point |
535 °C, 808 K, 995 °F |
| Solubility in water | 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
|
| R-phrases | R20/22 |
| S-phrases | (S2), S25 |
| Related compounds | |
| Other anions | Manganese disulfide |
| Other cations | Technetium dioxide Rhenium dioxide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Related pages
References
- ↑ 1.0 1.1 Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22. ISBN 978-0-618-94690-7.
