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Properties of substance:

propyne


methylacetylene;

Physical appearance:

gas

Empirical formula (Hill's system):

C3H4

Structural formula:

CH3CCH

Molar/atomic mass: 40.06

Melting point (°C):

-104.7

Boiling point (°C):

-23.23

Solubility (g/100 g of solvent):

benzene: soluble [Ref.]
water: 0.364 (25°C) [Ref.]
diethyl ether: very soluble [Ref.]
chloroform: soluble [Ref.]
ethanol: soluble [Ref.]

Properties:

Ionization Potentials (Electronvolts): 10.37
Bond distances (in pm): 145.9
Bond distances (in pm): 105.6
Bond distances (in pm): 110.5
Bond distances (in pm): 120.6
Bond angles (in degrees): 110.2

Density:

0.69 (-40°C, d4)

Vapour pressure (Torr):

7.5 (-94°C)
75 (-65.3°C)
750 (-23.2°C)

    Permittivity (dielectric constant):

    3.218 (-27.2°C)

    Dipole moment (D):

    0.784 (20°C)

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

    185.4 (g)

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

    248.2 (g)

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

    60.7 (g)

    Critical temperature (°C):

    129.2

    Critical pressure (MPa):

    5.63

    Critical volume (cm3/mol):

    163.5

    References:

    1. Binneweis M., Milke E. Thermochemical Data of Elements and Compounds. - 2ed, 2002. - pp. 266
    2. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 3-446, 5-23, 5-89, 6-67, 6-80, 6-151, 9-43, 9-58, 10-214, 16-15, 16-40
    3. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 48
    4. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 47
    5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 122
    6. Химическая энциклопедия. - Т.3. - М.: Советская энциклопедия, 1992. - pp. 58
    7. Химия ацетиленовых соединений. - под ред Вийе Г.Г. - М.: Химия, 1973. - pp. 34
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru