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Properties of substance:

pyrrole

Group of substances:

organic

Physical appearance:

colorless liquid

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

C4H5N

Structural formula as text:

(CH=CH)2NH

Molar/atomic mass: 67.09

Melting point (°C):

-23.4

Boiling point (°C):

130

Solubility (g/100 g of solvent):

water: 4.7 (25°C) [Ref.]

Hygroscopic:

yes

Numerical data:

Year of discovery: 1834

    Dissociation:

    pKBH+ (1) = -0.27 (25°C, water)

    Retention indices for gas chromatography:

    747 (phase - OV-101, 110°C)

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

    63.1 (l)

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

    156.4 (l)

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

    127.7 (l)

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

    108.2 (g)

    References:

    1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-25
    2. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 8-115
    3. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 88
    4. Альберт А., Сержент Е. Константы ионизации кислот и оснований. - М.-Л.: Химия, 1964. - pp. 140 [Russian]
    5. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 543-544 [Russian]
    6. Химия: справочное руководство. - Под ред. Гаврюченкова Ф.Г., Курочкиной М.И. и др. - Л.: Химия, 1975. - pp. 362-364 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru