Arsenopyrite

Formula : FeAsS

Family: 
Sulfides
Space group: 
Monoclinic - Prismatic HM symbol (2/m) Space Group: P 21/c

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
M
g·mol-1
 V°
cm3·mol-1
 ΔGºf
J·mol-1
 ΔHºf
J·mol-1
 Sº
J·mol-1·k-1
 CP
J·mol-1·K-1
162.835 26.270 (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 -136450 (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 -144370 (Ref.: Internal calculation) 68.500 (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 68.45 (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
CP(T) = a + b·T + ·c·T-2 (T in Kelvin)
a
J·mol-1·K-1
 b * 103
J·mol-1·K-2
 c * 10-5
J·K·mol-1
 Maier Kelley Ref.
75.51 4.78 -7.54 (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

Arsenopyrite + H+ + 1.5H2O ⇌ AsH3 + Fe+2 + HS-

298.15 K, 1 bar log10K: -92.13 ΔH°r:525884 J·mol-1 (Ref.: Internal calculation)
T(°C) 0 25 60 100 150 200 250 300
log10K -100.55 -92.13 -82.43 -73.56 -64.84 -58.01 -52.59 -48.31
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-569.136977 -0.095562 534.588893 209.873708 -1387774.831191