URANIUM(VI) FLUORIDE - (7783-81-5)

Wprowadzenie

Nazwa: uranium(VI) fluoride; uranium hexafluoride
* IUPAC
Numer CAS: 7783-81-5
Wzór chemiczny: UF6
Masa cząsteczkowa: 352.0193292 g
Stan skupienia: colorless solid
Procent Mass: U 67.618 %; F 32.381 % 

Klasyfikacja

Zastosowania / Funkcja

• "Fluorine is used in the nuclear industries of many countries to make uranium hexafluoride for enrichment of uranium in the fissile 235U isotope...Repeated diffusion of UF6 (g) through porous plugs (or centrifugation of the vapor) concentrates 235UF6 relative to 238UF6, since the speed of diffusion varies inversely as the square root of the molecular mass. This enrichment is not needed for fueling power reactors with good neutron economy, such as the Canadian CANDU system. Gaseous diffusion plants for UF6 are expensive, not least because UF6 is itself an aggressive fluorinating agent and thus must be contained in special fluorine-resistant materials." 1

Właściwości fizyczne



Gęstość (g/cm3):
5.09 at room temperature/pressure 2
* - 1 atm pressure

Rozpuszczalność

Jakościowy:

klejenie

klejenie: ionic
Ionic Character: 69.09 %

Termochemia

ΔHf° (s): -505 kcal/mol 3 = -2,112.92 kJ/mol
ΔHf° (s): -525.10 kcal/mol = -2197.0 kJ/mol 4
ΔHf° (g): -513.24 kcal/mol = -2147.4 kJ/mol 4
S° (s): 54.4 cal/(mol•K) 5 = 227.61 J/(mol•K)
S° (s): 54.40 cal/(mol•K) = 227.6 J/(mol•K) 6
S° (g): 90.32 cal/(mol•K) = 377.9 J/(mol•K) 6
ΔGf° (s): -485 kcal/mol 7 = -2,029.24 kJ/mol
ΔGf° (s): -494.38 kcal/mol = -2068.5 kJ/mol 8
ΔGf° (g): -493.24 kcal/mol = -2063.7 kJ/mol 8

reakcje

Po więcej informacji

źródła

(1) - Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; pp 230-231.
(2) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4-93.
(3) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(4) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 5-16.
(5) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(6) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 5-16.
(7) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(8) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 5-16.
(9) - Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; p 230.