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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

CAS No: 1303-86-2

Molar/atomic mass: 69.62

Melting point (°C):

450

Boiling point (°C):

2100

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.]

Density:

1.83 (20°C, g/cm3)

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