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Element Index

Oxygen

Osmium

Chemical's truth
Ricin is a natural poison extracted from the castor oil bean with a quoted LD50 of 20,000 ng/kg.


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Osmium(VIII) oxide

CAS no: 20816-12-0   Formula: OsO4   Molecular weight: 254.23

Physical Data

Appearance: Yellow monoclinic crystals

Melting point: 41°C
Boiling point: 135°C

Density: 5.1 g/cm3
Solubility: 6.44 g/100g H2O (20°C)


Thermodynamic Data

Enthalpy of formation: -394.1 kJ/mol
Gibbs energy of formation: -304.9 kJ/mol

Entropy: 143.9 J/mol K
Heat capacity: -


Production and preparation


Behavior and Chemical Properties


History and Uses


Hazard, Storage and Handling

(Last update: November 2004)


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