Rh(element)

Formula : Rh

Family: 
Element
Space group: 
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m
Dana class: 
1.2.1.3 (1) Native Elements (1.2) with platinum group metals and alloys (1.2.1) Platinum group (Space Group Fm3m)
High temperature: 
High temperature mineral
Geological context: 
Single grain found in a heavy mineral concentrate from a cummulate ultrabasic intrusion. Commonlyfond as impure phase associated with platineRh0.75PtRh0.75Pt0.25 it is a high temperature mineral.

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
102.906 8.281 (Ref.: 98sas/sho) Sassani, D.C., and Shock, E.L., Solubility and Transport of Platinum-Group Elements in Supercritical fluids: Estimates of standard partial molal properties, oxidation potentials, and hydrolysis constants at high temperatures and pressures: Geohim. Cosmo. Acta, v. 61, no. 20, pp. 4245-4266. 16 (Ref.: Internal calculation) 0 (Ref.: 98sas/sho) Sassani, D.C., and Shock, E.L., Solubility and Transport of Platinum-Group Elements in Supercritical fluids: Estimates of standard partial molal properties, oxidation potentials, and hydrolysis constants at high temperatures and pressures: Geohim. Cosmo. Acta, v. 61, no. 20, pp. 4245-4266. 31.506 (Ref.: 98sas/sho) Sassani, D.C., and Shock, E.L., Solubility and Transport of Platinum-Group Elements in Supercritical fluids: Estimates of standard partial molal properties, oxidation potentials, and hydrolysis constants at high temperatures and pressures: Geohim. Cosmo. Acta, v. 61, no. 20, pp. 4245-4266. 24.77 (Ref.: 98sas/sho) Sassani, D.C., and Shock, E.L., Solubility and Transport of Platinum-Group Elements in Supercritical fluids: Estimates of standard partial molal properties, oxidation potentials, and hydrolysis constants at high temperatures and pressures: Geohim. Cosmo. Acta, v. 61, no. 20, pp. 4245-4266.
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.
23.97 7.93 -1.39 (Ref.: 98sas/sho) Sassani, D.C., and Shock, E.L., Solubility and Transport of Platinum-Group Elements in Supercritical fluids: Estimates of standard partial molal properties, oxidation potentials, and hydrolysis constants at high temperatures and pressures: Geohim. Cosmo. Acta, v. 61, no. 20, pp. 4245-4266.
Reaction properties

Rh(element) + 0.5O2 + 2H+ ⇌ Rh+2 + H2O

298.15 K, 1 bar log10K: 22.69 ΔH°r:-169367 J·mol-1 (Ref.: 98sas/sho) Sassani, D.C., and Shock, E.L., Solubility and Transport of Platinum-Group Elements in Supercritical fluids: Estimates of standard partial molal properties, oxidation potentials, and hydrolysis constants at high temperatures and pressures: Geohim. Cosmo. Acta, v. 61, no. 20, pp. 4245-4266.
T(°C) 0 25 60 100 150 200 250 300
log10K 25.39 22.69 19.55 16.63 13.70 11.31 9.29 7.50
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-421.983650 -0.065807 31965.535589 150.716690 -1409249.015454