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Manganese dioxide

chemical compound

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
Names
IUPAC names
Manganese oxide
Manganese(IV) oxide
Other names
Pyrolusite, hyperoxide of manganese, black oxide of manganese, manganic oxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.013.821
EC Number 215-202-6
PubChem {{{value}}}
RTECS number OP0350000
SMILES {{{value}}}
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
ΔfHo298
−520 kJ·mol−1[1]
Standard molar
entropy
So298
53 J·mol−1·K−1[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 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 pagesEdit

ReferencesEdit

  1. 1.0 1.1 Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A22. ISBN 0-618-94690-X.