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An adiabatic solution calorimeter was used to measure enthalpies of solution in water of 8 samples of thymine for which analytical data are reported. Our best values for the enthalpy of solution and the change in heat capacity are    Δ   H  ∘   (  ∞  ,  298.15   K  )  =  (  24.32  ±  0.70  )   kJ  ⋅    mol    -  1Δ   C  p  ∘   =  (  106  ±  26  )   J  ⋅    mol    -  1    ⋅   K   -  1    ,  298   K  &lt;  T  &lt;  328   K  .    These were used to calculate Δ S ° = (53. 1 ± 3.6) J · mol -1 · K -1 for the entropy of solution, and    C   p  2   ∘   =  (  256  ±  26  )   J · mol -1 · K -1 for the apparent molal heat capacity at infinite dilution. No change in the enthalpy of solution with concentration was observed in the range of 5 to 35 mmol · kg -1 .

Enthalpies of solution of the nucleic acid bases. 2. Thymine in water