Low-temperature heat capacity and standard thermodynamic functions of D-galactose and galactitol

Abstract

The heat capacities of D-galactose and galactitol were measured on a quantum design physical property measurement system(PPMS) over a temperature range of 1.9―300 K, and the experimental data were fitted to a function of T using a series of theoretical and empirical models in appropriate temperature ranges. The fit results were used to calculate thermodynamic function values, C _p,m ^θ, Δ₀ ^T S _m ^θ, and Δ₀ ^T H _m ^θ from 0 K to 300 K. The standard molar heat capacity, entropy and enthalpy values of D-galactose and galactitol at 298.15 K and 0.1 MPa were determined to be C _p,m ^θ =(227.96±2.28) and (239.50±2.40) J·K⁻¹·mol⁻¹, S _m ^θ = (211.22±2.11) and (230.82±2.30) J·K⁻¹·mol⁻¹ and H _m ^θ = (33.95±0.34) and (36.57± 0.37) kJ/mol, respectively.

Keywords

D-Galactose / Galactitol / Low-temperature heat capacity / Physical property measurement system(PPMS) / Standard thermodynamic function

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