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Properties of substance:

tridymite

Group of substances:

inorganic

Physical appearance:

colorless hexagonal crystals

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

O2Si

Structural formula as text:

SiO2

Molar/atomic mass: 60.08

Melting point (°C):

1680

Solubility (g/100 g of solvent):

water: insoluble [Ref.]

Density:

2.264 (25°C, g/cm3)

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

-905.4 (s)

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

-851.6 (s)

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

43.5 (s)

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

44.6 (s)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-88
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 74 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru