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Properties of substance:

calcium diphosphate

Synonyms:

calcium pyrophosphate

Group of substances:

inorganic

Physical appearance:

colorless tetragonal crystals

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

Ca2O7P2

Structural formula as text:

Ca2P2O7

Molar/atomic mass: 254.099

Melting point (°C):

1358

Decomposition temperature (°C):

1200

Solubility (g/100 g of solvent):

water: insoluble [Ref.]

Density:

3.09 (20°C, g/cm3)

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

-3333 (s)

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

189.2 (s)

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

187.8 (s)

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

100.8

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-55
  2. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 138-139 [Russian]
  3. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 451 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru