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Properties of substance:

manganese(IV) oxide

Synonyms:

manganese dioxide

Group of substances:

inorganic

Physical appearance:

black tetragonal crystals

Empirical formula (Hill's system for organic substances):

MnO2

Structural formula as text:

MnO2

Molar/atomic mass: 86.94

Decomposition temperature (°C):

535

CAS №: 1313-13-9

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
hydrogen fluoride : insoluble [Ref.]
water: insoluble [Ref.]

Numerical data:

Hardness on the Mohs’ scale: 5.5

Density:

5.026 (20°C, g/cm3)

Reactions:

  1. Yeild 60%. [Ref.1]
    2MnO2 + 4KOH + O2 → 2K2MnO4 + 2H2O
  2. [Ref.1]
    C2H5OH + MnO2 + H2SO4 → CH3CHO + MnSO4 + 2H2O

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-521.5 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-466.7 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

53.1 (s)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

54.02 (s)

LD50 (mg/kg):

550 (mice, subcutaneous)

References:

  1. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 379-380 [Russian]
  2. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 304-305 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 79 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru