UF4 (s) + 1 F2 (g) → UF6 (s)

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Reaction Type:

Synthesis

Stoichiometry

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UF4            Mass: g
F2             Mass: g  or Gas Volume: L
UF6            Mass: g

Enthalpy of Reaction

[1ΔHf(UF6 (s))] - [1ΔHf(UF4 (s)) + 1ΔHf(F2 (g))]
[1(-2197)] - [1(-1853.51) + 1(0)] = -343.49 kJ
-343.49 kJ     (exothermic)

Entropy Change

[1ΔSf(UF6 (s))] - [1ΔSf(UF4 (s)) + 1ΔSf(F2 (g))]
[1(227.6)] - [1(151.04) + 1(202.71)] = -126.15 J/K
-126.15 J/K     (decrease in entropy)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(UF6 (s))] - [1ΔGf(UF4 (s)) + 1ΔGf(F2 (g))]
[1(-2068.5)] - [1(-1761.46) + 1(0)] = -307.04 kJ
-307.04 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-305.88 kJ     (spontaneous)

Equilibrium Constant, K (at 298.15 K)

6.22406112271984E+53
This process is favorable at 25°C.

Reference(s):

Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; p 230.

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