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Properties of substance:

methyl tribromide

Synonyms:

bromoform
tribromomethane

Group of substances:

organic

Physical appearance:

colorless liquid

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

CHBr3

Structural formula as text:

HCBr3

Molar/atomic mass: 252.75

Melting point (°C):

8.5

Boiling point (°C):

149.5

CAS №: 75-25-7

Solubility (g/100 g of solvent):

ammonia liquid : miscible [Ref.]
benzene: soluble [Ref.]
chloroform: soluble [Ref.]
diethyl ether: miscible [Ref.]
ethanol: miscible [Ref.]
formic acid: 25.3 (25°C) [Ref.]
ligroin: soluble [Ref.]
water: 0.3001 (15°C) [Ref.]
water: 0.319 (30°C) [Ref.]

Density:

2.8912 (20°C, g/cm3)

Reactions of synthesis:

  1. Yeild 65%. [Ref.1aster]
    CH3COCH3 + 3KBr + 3H2O → CHBr3 + CH3COOK + 2KOH + 3H2

Reactions:

  1. Ethane is brominated by tribromomethane or tetrabromomethane in the presence of aluminum bromide for 6 h at 55-65 °C form ethylbromide. Yeild 60%. [Ref.1]
    C2H6 + CHBr3 → C2H5Br + CH2Br2

Refractive index (nD):

1.598 (20°C)

Vapour pressure (Torr):

46 (15°C)

Permittivity (dielectric constant):

4.39 (20°C)

Viscosity (mPa·s):

1.89 (25°C)

Surface tension (mN/m):

44.87 (25°C)

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

43.45

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

-22.3 (l)

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

-5 (l)

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

220.9 (l)

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

130.7 (l)

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

23.8 (g)

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

8 (g)

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

330.9 (g)

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

71.2 (g)

LD50 (mg/kg):

1147 (rats, oral)

References:

  1. Blunt J.W., Munro M.H.G. Dictionary of marine Natural Products. - Chapman and Hall/CRC, 2008. - pp. 1880
  2. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 5-19
  3. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 12
  4. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 3
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 132 [Russian]
  6. Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 1105-1106 [Russian]
  7. Химия и жизнь. - 1990. - №5. - pp. 82 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru