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Manganese dioxide
Manganese(IV) oxide.jpg
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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 1313-13-9
PubChem 14801
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 ΔfHo298
−520 kJ·mol−1
Standard molar
entropy So298
53 J·mol−1·K−1
Hazards
EU classification Harmful (Xn)
Oxidizer (O)
NFPA 704

NFPA 704.svg

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)

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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