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Properties of substance:

tantalum(V) oxide

Group of substances:

inorganic

Physical appearance:

colorless rhombic crystals

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

O5Ta2

Structural formula as text:

Ta2O5

Molar/atomic mass: 441.89

Melting point (°C):

1870

Solubility (g/100 g of solvent):

water: insoluble [Ref.]

Density:

8.53 (20°C, g/cm3)

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

-2047 (s)

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

-1947.7 (s)

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

143.1 (s)

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

134.8 (s)

LD50 (mg/kg):

8000 (rats, oral)
4000 (mice, oral)

References:

  1. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - 2-е изд. - Л.: Химия, 1978. - pp. 104 [Russian]
  2. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 496 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru