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Properties of substance:

hydrazine hydrate

Group of substances:

inorganic

Physical appearance:

colorless liquid

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

H6N2O

Structural formula as text:

N2H4 * H2O

Molar/atomic mass: 50.06

Melting point (°C):

-51.6

Solubility (g/100 g of solvent):

chloroform: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: soluble [Ref.]
water: miscible [Ref.]

Numerical data:

Year of discovery: 1887

Density:

1.03 (21°C, g/cm3)

Vapour pressure (Torr):

740 (118.5°C)

Dissociation:

pKb (1) = 5.9 (25°C, water)

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

-242.6 (l)

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

-205 (g)

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

264 (g)

LD50 (mg/kg):

55 (rabbits, oral)
129 (rats, oral)
40 (guinea pig, oral)
83 (mice, oral)

References:

  1. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 51 [Russian]
  2. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 14-15 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru