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Properties of substance:

calcium hydride

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

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

H2Ca

Structural formula as text:

CaH2

Molar/atomic mass: 42.1

Melting point (°C):

814

Decomposition temperature (°C):

600

Solubility (g/100 g of solvent):

benzene: insoluble [Ref.]
carbon disulphide: insoluble [Ref.]
carbon tetrachloride: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: reaction [Ref.]
methanol: reaction [Ref.]
nitric acid: almost insoluble [Ref.]
oil of turpentine: insoluble [Ref.]
sulfuric acid: almost insoluble [Ref.]
water: reaction [Ref.]

Density:

1.7 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1]
    Ca + H2 → CaH2

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

-188.7 (s)

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

-149.8 (s)

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

42 (s)

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

41 (s)

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

21

References:

  1. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 244 [Russian]
  2. Жигач А.Ф., Стасиневич Д.С. Химия гидридов. - Л.: Химия, 1969. - pp. 89-95 [Russian]
  3. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 167-168 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 71 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru