Thermochemistry, thermodynamic functions, and molecular structures

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R. BOYD, S. SANWAL, S. SHARY-TEHRANY, AND D. MCNALLY

Table I1 : Expected and Observed Values of AS and Pressure Dependence of AG for Various Ionization Mechanisms -----AS, Expected

Reaction

+

+30

NaAlCla = Na+ AIClaNaAlC14 $. AICll = NaA1Cl8+ A1C14NaAlC14 AlzCla = NaAl2Cl6+ A1Cl42NaAlCla = NaZAlCl4+ AlCL-

+

a

+

+ +

0 0 0

cal deg -I----, Observeda

7.6 f 3 . 1 4 . 6 f3 . 1 33.1 f 3 . 3 -9.9 k 4 . 3

A H , kcal, observeda

76.5 f 2 . 8 72.9 f 2 . 8 96.5 zt 2.9 53.7 f 3.9

----Coefficient F statistic

33 5.6

0.57 11.6

.--a

Probability