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Properties of substance:

ammonium hexafluorosilicate

Group of substances:

inorganic

Physical appearance:

colorless cubic crystals

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

H8F6N2Si

Structural formula as text:

(NH4)2SiF6

Molar/atomic mass: 178.15

Decomposition temperature (°C):

300

Solubility (g/100 g of solvent):

ethanol: sparingly soluble [Ref.]
water: 18.58 (17.5°C) [Ref.]
water: 55.5 (100°C) [Ref.]

Properties of solutions:

15,7% (wt.), solvent - water
  Density (g/cm3) = 1.095 (17,5°)

Density:

2.011 (20°C, g/cm3)

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

-2688.6 (s)

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

284.5 (s)

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

247.9 (s)

References:

  1. Dean J.A. Lange's handbook of chemistry. - 1999. - pp. 3.15
  2. Perry D.L. Handbook of Inorganic Compounds. - 2nd ed. - CRC Press, 2011. - pp. 25
  3. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 100-101 [Russian]
  4. Рысс И.Г. Химия фтора и его неорганических соединений. - М., 1956. - pp. 365-367 [Russian]
  5. Успехи химии. - 1984. - Т.53, №9. - pp. 1467 [Russian]
  6. Фтор и его соединения. – Под ред. Саймонса Дж., Т. 1. - М.: ИИЛ, 1953. - pp. 117-120 [Russian]
  7. Фториды аммония. - М., 1988. - pp. 82-83 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru