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Properties of substance:

pyrazine



skc-file

Group of substances:

organic

Physical appearance:

colorless crystals

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

C4H4N2

Molar/atomic mass: 80.088

Melting point (°C):

54

Boiling point (°C):

115.5-115.8

Solubility (g/100 g of solvent):

diethyl ether: soluble [Ref.]
ethanol: soluble [Ref.]
water: very soluble [Ref.]

Numerical data:

Interatomic distances (in pm): 134

Density:

1.0311 (20°C, g/cm3)

Dissociation:

pKBH+ (1) = 5.8 (25°C, water)
pKBH+ (2) = 0.65 (25°C, water)

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

138.9 (s)

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

196.1 (g)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-25
  2. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 3-472
  3. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 520-521 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru