NDLI: Low-Temperature Heat Capacities and Standard Molar Enthalpy of Formation of Potassium Benzoate C$_{7}$H$_{5}$O$

Content Provider	SpringerLink
Author	Yang, Wei Wei Di, You Ying Yin, Zhen Fen Kong, Yu Xia Tan, Zhi Cheng
Copyright Year	2009
Abstract	Potassium benzoate C$_{7}$H$_{5}$O$_{2}$K (CAS Registry No. 582-25-2) was synthesized by the method of liquid phase reaction. Chemical and elemental analyses, FTIR, and X-ray powder diffraction (XRD) techniques were applied to characterize the composition and structure of the compound. Low-temperature heat capacities of the compound were measured by a precision automated adiabatic calorimeter over the temperature range from 78 K to 398 K. A polynomial equation of the heat capacities as a function of temperature was fitted by the least-squares method. Smoothed heat capacities and thermodynamic functions of the compound were calculated based on the fitted polynomial. In accordance with Hess’s law, a reasonable thermochemical cycle was designed, and 100 mL of 1 mol · dm$^{−3}$ NaOH solution was chosen as the calorimetric solvent. The standard molar enthalpies of dissolution for the reactants and products of the supposed reaction in the selected solvent were measured by an isoperibol solution-reaction calorimeter. Finally, the standard molar enthalpy of formation of the title compound C$_{7}$H$_{5}$O$_{2}$K (s) was derived to be -(610.94 ± 0.77) kJ · mol$^{−1}$.
Starting Page	542
Ending Page	554
Page Count	13
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	30
Issue Number	2
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2009-02-24
Publisher Place	Boston
Access Restriction	Subscribed
Subject Keyword	Adiabatic calorimetry Heat capacity Isoperibol solution-reaction calorimeter Potassium benzoate Standard molar enthalpy of formation Thermodynamic function Physical Chemistry Mechanics Condensed Matter Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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