| Autor: |
Kilday MV; Center for Thermodynamics and Molecular Science, National Bureau of Standards, Washington, D.C. 20234. |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of research of the National Bureau of Standards (1977) [J Res Natl Bur Stand (1977)] 1978 Nov-Dec; Vol. 83 (6), pp. 529-537. |
| DOI: |
10.6028/jres.083.034 |
| Abstrakt: |
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 - 1 Δ C p ∘ = ( 106 ± 26 ) J ⋅ mol - 1 ⋅ K - 1 , 298 K < T < 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 . |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
