WebElements Periodic Table of the Elements | Boron | enthalpies and thermodynamics properties

Boron: enthalpies and thermodynamic properties

Enthalpies

Enthalpy of fusion: 50 kJ mol^-1
Enthalpy of vaporisation: 507 kJ mol^-1
Enthalpy of atomisation: 563 kJ mol^-1

Thermodynamic data

Table: thermodynamic data for boron.
State	Δ_fH°	Δ_fG°	S°	C_pH	H°_298.15-H°₀
Units	kJ mol^-1	kJ mol^-1	J K^-1 mol^-1	J K^-1 mol^-1	kJ mol^-1
Solid (rhombic)	*0	0	*5.90 ± 0.08	11.1	*1.222 ± 0.008
Gas	*565 ± 5	519	*153.436 ± 0.015	20.80	*6.316 ± 0.002
Bas (B₂)	831	774	201.8	30.5	8.76

Notes

This tables gives a few thermodynamic data. Most values are those given in the NBS technical notes (reference 1) after conversion from the units used within those notes. Values labelled with an asterisk (*) are Committee on Data for Science and Technology (CODATA) agreed values for the thermodynamic properties of key chemical substances (reference 2). These values are published in a number of places including the WWW (reference 3).

References

R.H. Schumm, D.D. Wagman, S. Bailey, W.H. Evans, and V.B. Parker in National Bureau of Standards (USA) Technical Notes 270-1 to 270-8, 1973.
http://www.codata.org/resources/databases/key1.html
J.D. Cox, DD., Wagman, and V.A. Medvedev, CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, USA, 1989.

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Be	B	C
Mg	Al	Si

Boron	Bore
Bor	Boor
Boro	Boro
Bor	Boro

Boron
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