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Properties of substance:

boron oxide

Synonyms:

boron trioxide

Group of substances:

inorganic

Physical appearance:

colorless amorphous substance

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

B2O3

Structural formula as text:

B2O3

Molar/atomic mass: 69.62

Melting point (°C):

450

Boiling point (°C):

2100

CAS №: 1303-86-2

Solubility (g/100 g of solvent):

sulfuric acid: soluble [Ref.]
water: 1.1 (10°C) [Ref.]
water: 3.3 (20°C) [Ref.]
water: 15.7 (100°C) [Ref.]

Not numerical data:

hygroscopic

Density:

1.83 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster]
    2H3BO3 → B2O3 + 3H2O

Reactions:

  1. [Ref.1aster]
    6NaBF4 + B2O3 + 6H2SO4 → 8BF3 + 6NaHSO4 + 3H2O

Vapour pressure (Torr):

0.1 (1324°C)
1 (1489°C)

Viscosity (mPa·s):

5020 (1137°C)
3840 (1217°C)
2700 (1317°C)
1870 (1417°C)
1300 (1517°C)
918 (1617°C)

Surface tension (mN/m):

72.4 (700°C)
79.4 (1000°C)
90.1 (1200°C)
97.1 (1400°C)

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

-1254 (s)

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

80.8 (s)

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

62.76 (s)

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

356

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

-843.8 (g)

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

-832 (g)

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

279.8 (g)

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

66.9 (g)

LD50 (mg/kg):

3163 (mice, oral)
1868 (mice, intraperitoneal)

References:

  1. Gangolli S. The Dictionary of Substances and their Effects. - 2 ed., Vol. 1, A-B. - RSC, 1999. - pp. 658
  2. Lewis R.J. Sax's Dangerous Properties of Industrial Materials. - 11ed. - Wiley-interscience, 2004. - pp. 538
  3. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 193-195 [Russian]
  4. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 104-105 [Russian]
  5. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 9 [Russian]
  6. Немодрук А.А., Каралова З.К. Аналитическая химия бора. - М.: Наука, 1964. - pp. 14-15 [Russian]
  7. Неорганическая химия. - Под ред. Третьякова Ю.Д., Т.2. - М.: Academa, 2004. - pp. 89-90 [Russian]
  8. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 56 [Russian]
  9. Реми Г. Курс неорганической химии. - Т.1. - М., 1963. - pp. 373 [Russian]
  10. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 296 [Russian]
  11. Химическая технология неорганических веществ. - Кн.1, под ред. Ахметова Т.Г. - М.: Высшая школа, 2002. - pp. 247-250 [Russian]
  12. Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 301 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru