S(alpha)

Formula : S

Family: 
Space group: 
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: F ddd
Dana class: 
1.3.5.1 (1) Native Elements (1.3) with semi-metallic and non-metallic elements (1.3.5) Sulfur Polymorph group
High temperature: 
Stable at TC<95C
Geological context: 
Occurs as native metalloid in volcanic exhalations and bacterial reduction of sulfates in sediments (S8). But also in slags as condensates

Dernière mise à jour le 11.06.2018

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
32.066 15.920 0 0 32.054 22.56
Reaction properties

S(alpha) + H2O ⇌ HS- + 0.5O2 + H+

298.15 K, 1 bar log10K: -45.14 ΔH°r: -605310 J·mol-1
T(°C) 0 25 60 100 150 200 250 300
log10K -49.38 -45.14 -40.31 -35.95 -31.74 -28.50 -26.00 -24.12