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Low-temperature heat capacities and standard molar enthalpy of formation of aspirin

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Abstract

Molar heat capacities (C p,m) of aspirin were precisely measured with a small sample precision automated adiabatic calorimeter over the temperature range from 78 to 383 K. No phase transition was observed in this temperature region. The polynomial function of C p,m vs. T was established in the light of the low-temperature heat capacity measurements and least square fitting method. The corresponding function is as follows: for 78 K≤T≤383 K, C p,m/J mol-1 K-1=19.086X 4+15.951X 3-5.2548X 2+90.192X+176.65, [X=(T-230.50/152.5)]. The thermodynamic functions on the base of the reference temperature of 298.15 K, {ΔH T -ΔH 298.15} and {S T-S 298.15}, were derived. Combustion energy of aspirin (Δc U m) was determined by static bomb combustion calorimeter. Enthalpy of combustion (Δc H o m) and enthalpy of formation (Δf H o m) were derived through Δc U m as - (3945.26±2.63) kJ mol-1 and - (736.41±1.30) kJ mol-1, respectively.

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Authors and Affiliations

  1. Material Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China

    F. Xu, L.-X. Sun, Z.-C. Tan, Y.-Y. Di, Q.-F. Tian & T. Zhang

  2. Hunan Institute of Drug Detection, Changsha, 410001, P.R. China

    J.-G. Liang

Authors
  1. F. Xu
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  2. L.-X. Sun
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  3. Z.-C. Tan
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  4. J.-G. Liang
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  5. Y.-Y. Di
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  6. Q.-F. Tian
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  7. T. Zhang
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Correspondence to L.-X. Sun.

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Xu, F., Sun, LX., Tan, ZC. et al. Low-temperature heat capacities and standard molar enthalpy of formation of aspirin. Journal of Thermal Analysis and Calorimetry 76, 481–489 (2004). https://doi.org/10.1023/B:JTAN.0000028027.37960.8a

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  • DOI: https://doi.org/10.1023/B:JTAN.0000028027.37960.8a

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