U3O8

Formula : U3O8

Family: 
Oxides

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
842.082 100.487 (Ref.: 95rob/hem) Robie R.A., and Hemingway B.S., 1995. Thermodynamic properties of minerals and related substances at 298.15 K and 1 Bar (105 Pascals) pressure and at higher temperatures. U.S. Geol. Survey Bull., 2131, 461 pp. -3369477 (Ref.: Internal calculation) -3574800 (Ref.: 89cox/wag) Cox J.D., Wagman D.D., and Medvedev V.A., 1989. CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., New York, 279 p. 282.550 (Ref.: 89cox/wag) Cox J.D., Wagman D.D., and Medvedev V.A., 1989. CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., New York, 279 p. 238.96 (Ref.: 89bar/sau) Barin, I., F. Sauert, et al. (1989). Thermochemical Data of Pure Substances. Germany, VCH, Verlagsgesellschaft.
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.
279.17 27.66 -43.08 (Ref.: 89bar/sau) Barin, I., F. Sauert, et al. (1989). Thermochemical Data of Pure Substances. Germany, VCH, Verlagsgesellschaft.
Reaction properties

U3O8 + 4H+ ⇌ 2UO2+ + UO2+2 + 2H2O

298.15 K, 1 bar log10K: -3.60 ΔH°r:-66279 J·mol-1 (Ref.: 89cox/wag) Cox J.D., Wagman D.D., and Medvedev V.A., 1989. CODATA Key Values for Thermodynamics. Hemisphere Publishing Corp., New York, 279 p.
T(°C) 0 25 60 100 150 200 250 300
log10K -2.59 -3.60 -4.88 -6.18 -7.62 -8.94 -10.22 -11.51
log10K(T) = A + B·T + C·T-1 + D·log10(T) + E·T−2 (T in Kelvin)
A B C D E
-637.918542 -0.106469 37678.137064 227.727115 -2115901.033856