THERMODYNAMIC PROPERTIES OF HIGHER FLUORIDES. II. THE HEATS OF SOLUTION AND OF FORMATION OF MOLYBDENUM HEXAFLUORIDE, TUNGSTEN HEXAFLUORIDE AND NIOBIUM PENTAFLUORIDE1a

1960 ◽  
Vol 64 (5) ◽  
pp. 591-594 ◽  
Author(s):  
O. E. Myers ◽  
A. P. Brady
Keyword(s):  
Thermodynamic Properties ◽  
Heats Of Solution ◽  
Tungsten Hexafluoride ◽  
Molybdenum Hexafluoride

Heats of formation of zirconium hydrides

1964 ◽  
Vol 17 (10) ◽  
pp. 1063 ◽  
Author(s):  
AG Turnbull
Keyword(s):  
Heat Capacity ◽  
Thermodynamic Properties ◽  
Heats Of Formation ◽  
Kcal Mole ◽  
Dissociation Pressure ◽  
Heats Of Solution ◽  
Zirconium Hydrides ◽  
Zirconium Metal

Heats of solution in 3.83N HF have been measured for zirconium metal and for five zirconium hydrides to evaluate the following heats of formation AHf0298: ZrH2 -39.7, ZrH1.85 -38.2, ZrH1.70. -34.7, ZrH1.43 -30.05, ZrH1.23 -25.3 kcal/mole hydride. A review of heat capacity and entropy data for zirconium hydrides has enabled a good correlation to be made between calorimetric and dissociation pressure studies, so that the effect of composition on all thermodynamic properties is established.

The Heats of Solution and Related Thermodynamic Properties of Sodium Chlorate in Water and Water–Dioxane Mixtures

1971 ◽  
Vol 49 (2) ◽  
pp. 217-224 ◽  
Author(s):  
A. N. Campbell ◽  
O. Bhatnagar
Keyword(s):  
Free Energy ◽  
Thermodynamic Properties ◽  
Activity Coefficients ◽  
Direct Method ◽  
Sodium Chlorate ◽  
Saturated Solution ◽  
Heat Of Solution ◽  
Heats Of Solution ◽  
Tentative Explanation ◽  
A Direct Method

The heats of solution of sodium chlorate in water, and in several water-dioxane mixtures, have been determined experimentally at concentrations of salt ranging from 0.01 molal to saturation. For the dilute region, a direct method was used but for the concentrated range the method was that of diluting the saturated solution. The free energy decreases due to dilution have been calculated from previously determined activity coefficients. Using these data, the entropy changes have been evaluated.The graph of heat of solution vs. concentration of sodium chlorate passes through a minimum for the solutions more concentrated in dioxane, but not for water and weak dioxane mixtures. A tentative explanation of this is offered.

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