| Popis: |
The heat capacities of three para-halotoluenes, p -chlorotoluene, p -bromotoluene and p -iodotoluene, were measured with an adiabatic calorimeter. All three compounds showed the formation of glassy crystals. The glass transition temperatures are 220, 242 and 250 K respectively. The temperature and enthalpies of fusion are: for p -chlorotoluene, 280.69 ± 0.01 K and 13554 J mol −1 ; for p -bromotoluene, 299.94 ± 0.01 K and 15127 J mol −1 ; and for p -iodotoluene, 306.70 ± 0.05 K and 14963 J mol −1 . The heat capacity of p -iodotoluene was measured from 5 K; the derived thermodynamic properties are given. Those of the other compounds were measured from 80 K. |
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