Quick facts for kids 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 |
Standard molar entropy S |
53 J·mol−1·K−1 |
Hazards | |
EU classification | Harmful (Xn) Oxidizer (O) |
NFPA 704 |
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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 noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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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Manganese dioxide Facts for Kids. Kiddle Encyclopedia.