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Properties of substance:

calcium sulfate hemihydrate

Group of substances:

inorganic

Physical appearance:

colorless monoclinic crystals

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

H2Ca2O9S2

Structural formula as text:

2CaSO4 * H2O

Molar/atomic mass: 145.15

Decomposition temperature (°C):

163

Solubility (g/100 g of solvent):

glycerol: soluble [Ref.]
water: 0.965 (0.9°C) [Ref.]
water: 0.933 (14.5°C) [Ref.]
water: 0.818 (21.7°C) [Ref.]
water: 0.201 (96.5°C) [Ref.]

Density:

2.7 (20°C, g/cm3)

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

-1573 (s)

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

-1435 (s)

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

134 (s)

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

121 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-56
  2. Беликов В.Г. Учебное пособие по фармацевтической химии. - М.: Медицина, 1979. - pp. 54 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 72 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru