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Properties of substance:

1H-pyrazole



skc-file

Group of substances:

organic

Physical appearance:

colorless needles crystals

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

C3H4N2

Molar/atomic mass: 68.077

Melting point (°C):

70

Boiling point (°C):

186

Solubility (g/100 g of solvent):

benzene: 38.6 (20°C) [Ref.]
diethyl ether: very soluble [Ref.]
ethanol: very soluble [Ref.]
ligroin: sparingly soluble [Ref.]
water: 270 (24.8°C) [Ref.]

Density:

1.001 (99.8°C, g/cm3)

Refractive index (nD):

1.4203 (25°C)
1.47027 (99.8°C)

Dipole moment (D):

1.46 (20°C)

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

105.4 (s)

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

81 (s)

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

179.4 (g)

References:

  1. Armarego W. L. F. Purification of Laboratory Chemicals. - 7ed. - 2013. - pp. 476
  2. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-23
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 172 [Russian]
  4. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 521-522 [Russian]
  5. Химия: справочное руководство. - Под ред. Гаврюченкова Ф.Г., Курочкиной М.И. и др. - Л.: Химия, 1975. - pp. 368-369 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru