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Properties of substance:

molybdenum(VI) oxide

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

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

MoO3

Structural formula as text:

MoO3

Molar/atomic mass: 143.94

Melting point (°C):

801

Boiling point (°C):

1155

Solubility (g/100 g of solvent):

hydrogen fluoride : reaction [Ref.]
water: 0.1066 (18°C) [Ref.]
water: 0.1856 (23°C) [Ref.]
water: 0.2638 (30°C) [Ref.]
water: 0.7855 (54°C) [Ref.]
water: 1.2057 (60°C) [Ref.]
water: 2.055 (70°C) [Ref.]
water: 2.1064 (79°C) [Ref.]

Density:

4.69 (20°C, g/cm3)

Reactions:

  1. [Ref.1aster]
    MoO3 + 3H2 → Mo + 3H2O

Vapour pressure (Torr):

1 (734°C)
10 (797°C)
100 (954°C)

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

-745.2 (s)

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

-668.1 (s)

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

77.74 (s)

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

75.02 (s)

Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

49

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

138

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

-363 (g)

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

279 (g)

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

59 (g)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1015
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 81 [Russian]
  3. Реми Г. Курс неорганической химии. - Т.2. - М., 1966. - pp. 186 [Russian]
  4. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 342 [Russian]
  5. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 128 [Russian]
  6. Химия и технология редких и рассеянных элементов. - Ч. 3. - М.: Высшая школа, 1976. - pp. 162-165 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru