Loellingite

Formula : FeAs2

Family: 
Space group: 
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
cm3·mol-1
ΔGºf
J·mol-1
ΔHºf
J·mol-1
J·mol-1·k-1
CP
J·mol-1·K-1
205.690 27.440 (Ref.: 08per/pok) Perfetti E., Pokrovski G., Ballerat-Busserolles K., Majer V., Gibert F. (2008) Densities and heat capacities of aqueous arsenious and arsenic acid solutions to 350 C and 300 bar, and revised thermodynamic properties of As(OH)3(aq), AsO(OH)3(aq) and iron sulfarsenide minerals. Geochimica et Cosmochimica Acta 72, 713-731 -80230 (Ref.: 08per/pok) Perfetti E., Pokrovski G., Ballerat-Busserolles K., Majer V., Gibert F. (2008) Densities and heat capacities of aqueous arsenious and arsenic acid solutions to 350 C and 300 bar, and revised thermodynamic properties of As(OH)3(aq), AsO(OH)3(aq) and iron sulfarsenide minerals. Geochimica et Cosmochimica Acta 72, 713-731 -85776 (Ref.: Internal calculation) 80.100 (Ref.: 08per/pok) Perfetti E., Pokrovski G., Ballerat-Busserolles K., Majer V., Gibert F. (2008) Densities and heat capacities of aqueous arsenious and arsenic acid solutions to 350 C and 300 bar, and revised thermodynamic properties of As(OH)3(aq), AsO(OH)3(aq) and iron sulfarsenide minerals. Geochimica et Cosmochimica Acta 72, 713-731 70.83 (Ref.: 08per/pok) Perfetti E., Pokrovski G., Ballerat-Busserolles K., Majer V., Gibert F. (2008) Densities and heat capacities of aqueous arsenious and arsenic acid solutions to 350 C and 300 bar, and revised thermodynamic properties of As(OH)3(aq), AsO(OH)3(aq) and iron sulfarsenide minerals. Geochimica et Cosmochimica Acta 72, 713-731
Reaction properties

Loellingite + 2H+ + 2H2O ⇌ 2AsH3 + Fe+2 + O2

298.15 K, 1 bar log10K: -119.08 ΔH°r:691640 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K -130.09 -119.08 -106.25 -94.35 -82.46 -72.94 -65.13 -58.58