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Properties of substance:

tungsten(VI) oxide

Group of substances:

inorganic

Physical appearance:

yellow triclinic crystals

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

O3W

Structural formula as text:

WO3

Molar/atomic mass: 231.85

Melting point (°C):

1473

Boiling point (°C):

1670

Solubility (g/100 g of solvent):

hydrogen fluoride : insoluble [Ref.]
water: 0.002 [Ref.]

Density:

7.2 (20°C, g/cm3)

Reactions:

  1. [Ref.1aster]
    CaCO3 + WO3 → CaWO4 + CO2
  2. [Ref.1aster]
    BaCO3 + WO3 → BaWO4 + CO2

Vapour pressure (Torr):

1 (1300°C)
10 (1408°C)

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

-842.7 (s)

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

-763.9 (s)

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

75.94 (s)

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

73.85 (s)

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

73.43

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-97
  2. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 372 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 60 [Russian]
  4. Химия и технология редких и рассеянных элементов. - Ч. 3. - М.: Высшая школа, 1976. - pp. 223-225 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru