Heat
capacities and thermodynamic properties of 2-benzoylpyridine (C12H9NO) |
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Authors: | M-H Wang Z-C Tan Q Shi L-X Sun T Zhang |
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Institution: | (1) Thermochemistry Laboratory, Dalian Institute of Chemical Physics , Chinese Academy of Sciences, Dalian, P. R. China, 116023 |
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Abstract: | The
heat capacities of 2-benzoylpyridine were measured with an automated adiabatic
calorimeter over the temperature range from 80 to 340 K. The melting point,
molar enthalpy, ΔfusHm,
and entropy, ΔfusSm,
of fusion of this compound were determined to be 316.49±0.04 K, 20.91±0.03
kJ mol–1 and 66.07±0.05 J mol–1
K–1, respectively. The purity of the compound
was calculated to be 99.60 mol% by using the fractional melting technique.
The thermodynamic functions (HT–H298.15) and (ST–S298.15) were calculated based
on the heat capacity measurements in the temperature range of 80–340
K with an interval of 5 K. The thermal properties of the compound were further
investigated by differential scanning calorimetry (DSC). From the DSC curve,
the temperature corresponding to the maximum evaporation rate, the molar enthalpy
and entropy of evaporation were determined to be 556.3±0.1 K, 51.3±0.2
kJ mol–1 and 92.2±0.4 J K–1
mol–1, respectively, under the experimental
conditions. |
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Keywords: | adiabatic calorimetry 2-benzoylpyridine DSC heat capacity thermodynamic functions |
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