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Properties of substance:

iron(III) oxide α-form

Group of substances:

inorganic

Physical appearance:

reddish brown trigonal crystals

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

Fe2O3

Structural formula as text:

Fe2O3

Molar/atomic mass: 159.69

Melting point (°C):

1565

Decomposition temperature (°C):

1565

Solubility (g/100 g of solvent):

bismuth(III) oxide molten: 8.7 (820°C) [Ref.]
water: insoluble [Ref.]

Density:

5.25 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1]
    4FeS2 + 11O2 → 2Fe2O3 + 8SO2

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

-822.2 (s)

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

-740.3 (s)

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

87.4 (s)

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

103.8 (s)

Neel temperature (K):

955

References:

  1. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 409 [Russian]
  2. Лидин Р.А., Андреева Л.Л., Молочко В.А. Константы неорганических веществ. - М.: Дрофа, 2006. - pp. 109 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 63 [Russian]
  4. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 200 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru