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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):
Fe
2
O
3
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/cm
3
)
Reactions of synthesis:
[
Ref.1
]
4FeS
2
+ 11O
2
→ 2Fe
2
O
3
+ 8SO
2
Reactions:
[
Ref.1
,
Ref.2
,
Ref.3
,
Ref.4
,
Ref.5
]
Fe
2
O
3
+ 3H
2
→ 2Fe + 3H
2
O
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-822.2 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-740.3 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
87.4 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
103.8 (s)
Neel temperature (K):
955
References:
Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 409 [Russian]
Лидин Р.А., Андреева Л.Л., Молочко В.А. Константы неорганических веществ. - М.: Дрофа, 2006. - pp. 109 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 63 [Russian]
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