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Properties of substance:

calcium oxide

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

CaO

Structural formula as text:

CaO

Molar/atomic mass: 56.08

Melting point (°C):

2580

Boiling point (°C):

2850

Solubility (g/100 g of solvent):

calcium chloride fused: 16.1 (910°C) [Ref.]
ethanol: practically insoluble [Ref.]
ethyl acetate: insoluble [Ref.]
hydrazine: insoluble [Ref.]
water: reaction [Ref.]

Density:

3.4 (20°C, g/cm3)

Reactions:

  1. [Ref.1]
    CaO + 3C → CaC2 + CO
  2. [Ref.1]
    CaCl2 + CaO + H2O → 2CaOHCl

Refractive index (nD):

1.838 (20°C)

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

-635.5 (s)

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

-604.2 (s)

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

39.7 (s)

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

42.8 (s)

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

50

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

-26 (g)

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

219.6 (g)

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

32.5 (g)

LD50 (mg/kg):

3059 (white mice, intraperitoneal)

References:

  1. Вредные химические вещества: Неорганические соединения элементов I-IV групп. Справочник. - Л.: Химия, 1988. - pp. 115 [Russian]
  2. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 138-139 [Russian]
  3. Монастырев А.В. Производство извести. - М.: Высшая школа, 1971 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 72 [Russian]
  5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 780 [Russian]
  6. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 92-93 [Russian]
  7. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 297-298 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru