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The free energy, heat and entropy of formation of thorium tetrafluoride

Authors
Journal
Journal of Inorganic and Nuclear Chemistry
0022-1902
Publisher
Elsevier
Publication Date
Volume
15
Identifiers
DOI: 10.1016/0022-1902(60)80066-8
Disciplines
  • Physics

Abstract

Abstract The equilibrium constant for the reaction, ThF 4( s) + SiO 2( s) ⇌ ThO 2( s) + SiF 4( g) was determined over the temperature interval 871°–1077°K by measuring the equilibrium pressure of SiF 4 above the system. The pressure of SiF 4 from this reaction is given by log P (atm) = −8200 ± 120 T(∘K) + 7.740 ± 0.130. A heat capacity correction of −2·76 cal deg −1 mole −1 gives for the reaction at 298°K, ΔF° = 27·9 kcal/mole, ΔH° = 39·4 kcal/mole, and ΔS° = 38·7 cal deg −1mole −1. From these and existing thermodynamic data for SiO 2, ThO 2 and SiF 4 the ΔF°, ΔH° and ΔS° of formation of ThF 4 from the elements at 298°K were calculated to be −459·9 kcal/mole, −482·4 kcal/mole and −75·8 cal deg −1 mole −1, respectively.

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