Chemical Properties of Osmium (CAS 7440-04-2)

InChI

InChI=1S/Os

InChI Key

SYQBFIAQOQZEGI-UHFFFAOYSA-N

Formula

Os

SMILES

[Os]

Molecular Weight¹

190.23

CAS

7440-04-2

• η : Dynamic viscosity (Pa×s).
• EA : Electron affinity (eV).
• IE : Ionization energy (eV).
• P_vap : Vapor pressure (kPa).
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
EA	1.08 ± 0.00	eV	NIST
IE	[8.15; 8.70]	eV
IE	8.70	eV	NIST
IE	8.70	eV	NIST
IE	8.15 ± 0.09	eV	NIST
IE	8.70	eV	NIST

Cheméo can also estimate Normal Boiling Point Temperature, Normal melting (fusion) point, Critical Temperature, Critical Pressure, Critical Volume, Enthalpy of formation at standard conditions, Enthalpy of vaporization at standard conditions, Standard Gibbs free energy of formation, Acentric Factor, Log10 of Water solubility in mol/l for this compound, but they fall outside the models' validated range, so they are not shown here. Open the prediction tool to compute them on demand.

Temperature Dependent Properties

Property	Value	Unit	Temperature (K)	Source
η	[0.0053000; 0.0074000]	Pa×s	[3265.00; 3542.00]
η	0.0074000	Pa×s	3265.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0072000	Pa×s	3290.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0070000	Pa×s	3306.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0070000	Pa×s	3315.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0067000	Pa×s	3340.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0065000	Pa×s	3365.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0063000	Pa×s	3390.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0061000	Pa×s	3415.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0060000	Pa×s	3440.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0058000	Pa×s	3465.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0056000	Pa×s	3490.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0055000	Pa×s	3515.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
η	0.0053000	Pa×s	3542.00	Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation

Correlations

Property	Value	Unit	Temperature (K)	Source
Pvap	[5.07e-05; 314.15]	kPa	[2873.15; 5673.15]	The Yaws Handbook of Vapor Pressure
Equation			ln(Pvp) = A + B/(T + C)
Coefficient A			2.04708e+01
Coefficient B			-8.00173e+04
Coefficient C			-2.37540e+02
Temperature range, min.			2873.15
Temperature range, max.			5673.15
Pvap	5.07e-05	kPa	2873.15	Calculated Property
Pvap	1.25e-03	kPa	3184.26	Calculated Property
Pvap	0.02	kPa	3495.37	Calculated Property
Pvap	0.14	kPa	3806.48	Calculated Property
Pvap	0.86	kPa	4117.59	Calculated Property
Pvap	3.97	kPa	4428.71	Calculated Property
Pvap	14.85	kPa	4739.82	Calculated Property
Pvap	46.85	kPa	5050.93	Calculated Property
Pvap	128.53	kPa	5362.04	Calculated Property
Pvap	314.15	kPa	5673.15	Calculated Property

Sources

• Cheméo Relay (1.0, beta) Beta: served but experimental, data-limited and below our cross-validation release bar; the Joback value is recommended where available.
• Viscosity of molten Mo, Ta, Os, Re, and W measured by electrostatic levitation
• NIST Webbook
• The Yaws Handbook of Vapor Pressure

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