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Properties of substance:

mercury(II) oxide yellow

Group of substances:

inorganic

Physical appearance:

yellow rhombic crystals

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

HgO

Structural formula as text:

HgO

Molar/atomic mass: 216.59

Decomposition temperature (°C):

400

Solubility (g/100 g of solvent):

acetone: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: insoluble [Ref.]
water: 0.0052 (25°C) [Ref.]
water: 0.041 (100°C) [Ref.]

Density:

11.03 (20°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1]
    Hg3O2(NO3)2 + H2O → 3HgO + 2HNO3

Reactions:

  1. [Ref.1, Ref.2aster]
    2Cl2 + HgO → Cl2O + HgCl2

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

-90.5 (s)

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

-58.5 (s)

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

71.29 (s)

References:

  1. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 194 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 92-93 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru