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Properties of substance:

phosphorus black

Group of substances:

inorganic

Physical appearance:

black rhombic crystals

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

P

Structural formula as text:

P

Molar/atomic mass: 30.974

Sublimation point (°C):

453

Solubility (g/100 g of solvent):

carbon disulphide: insoluble [Ref.]
sulfuric acid: insoluble [Ref.]

Numerical data:

Year of discovery: 1934

Density:

2.69 (20°C, g/cm3)

Vapour pressure (Torr):

1 (290°C)
10 (337.5°C)
100 (394°C)

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

    -38.9 (s)

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

    -33.4 (s)

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

    22.7 (s)

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

    21.6 (s)

    References:

    1. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 452 [Russian]
    2. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 442 [Russian]
    3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 107 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru