Journal of Chemical Thermodynamics p. 771 - 780 (1987)
Update date:2022-08-10
Topics:
Allot, Philip H.
Finch, Arthur
Pilcher, Geoffrey
Nunez, Lisardo
Barral, Luis
The standard (p0 = 101.325 kPa) molar enthalpies of formation at 298.15 K of crystalline 2,4,6-tribromophenol and of 2,4,6-tribromoaniline were determined by both solution-reaction calorimetry and by rotating-bomb calorimetry.The values from the two methods agreed to within the limits of experimental error.The standard molar enthalpies of sublimation at 298.15 K were measured by microcalorimetry. 2,4,6-Tribromophenol: ΔfH0m(cr) = -98.5+/-2.3 kJ*mol-1, ΔgcrH0m = 97.6+/-1.1 kJ*mol-1; 2,4,6-tribromoaniline: ΔfH0m(cr) = 57.9+/-2.4 kJ*mol-1, ΔgcrH0m = 101.1+/-1.1 kJ*mol-1.The derived standard molar enthalpies of formation of the gaseous compounds were compared with values estimated assuming that each group, when substituted into the benzene ring, produces a characteristic increment in the enthalpy of formation.
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