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Properties of substance:

chromium(VI) oxide

Group of substances:

inorganic

Physical appearance:

red rhombic crystals

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

CrO3

Structural formula as text:

CrO3

Molar/atomic mass: 99.99

Melting point (°C):

196

Decomposition temperature (°C):

197-550

Solubility (g/100 g of solvent):

diethyl ether: soluble [Ref.]
ethyl acetate: soluble [Ref.]
sulfuric acid: soluble [Ref.]
water: 163 (0°C) [Ref.]
water: 166 (15°C) [Ref.]
water: 167 (20°C) [Ref.]
water: 171 (40°C) [Ref.]
water: 175 (60°C) [Ref.]
water: 190 (80°C) [Ref.]
water: 199 (100°C) [Ref.]

Properties of solutions:

57% (wt.), solvent - water
  Freezing point (°C) = -113.

Hygroscopic:

very hygroscopic

Density:

2.7 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster, Ref.2aster]
    K2Cr2O7 + 2H2SO4 → 2CrO3 + 2KHSO4 + H2O
  2. [Ref.1aster, Ref.2aster, Ref.3]
    Na2Cr2O7 + 2H2SO4 → 2CrO3 + 2NaHSO4 + H2O
  3. [Ref.1aster]
    BaCrO4 + 2HNO3 → CrO3 + Ba(NO3)2 + H2O

Reactions:

  1. [Ref.1aster]
    2KOH + CrO3 → K2CrO4 + H2O

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

-590.4 (s)

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

73.2 (s)

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

-295 (g)

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

271 (g)

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

58 (g)

References:

  1. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 446-449
  2. Лаврухина А.К., Юкина Л.В. Аналитическая химия хрома. - М.: Наука, 1979. - pp. 17 [Russian]
  3. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 372 [Russian]
  4. Неорганические соединения хрома: Справочник. - Л.: Химия, 1981. - pp. 16-18 [Russian]
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 111 [Russian]
  6. Реми Г. Курс неорганической химии. - Т.2. - М., 1966. - pp. 170-172 [Russian]
  7. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 339-340 [Russian]
  8. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 244-245 [Russian]
  9. Химическая технология неорганических веществ. - Кн.2, под ред. Ахметова Т.Г. - М.: Высшая школа, 2002. - pp. 118-129 [Russian]
  10. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 313 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru