中文摘要：

用全自动低温绝热量热计测定了水和正丁醇二元体系（0．716H2O＋0．284n—C4H9OH）在78-320K温区的摩尔热容Cp,m．建立了Cp,m与温度T的函数关系．结果表明，该水和正丁醇二元混合体系在（111．9±1．2）K发生玻璃化转变，在（179．26±0．77）K和（269．69±0．14）K发生分别对应正丁醇和水的固液相变．获得了水的相变焓和相变熵．计算了以298．15K为基准的混合物的热力学函数．

英文摘要：

The molar heat capacity values of the binary system composed of 0.716 molar fraction H2O＋ 0. 284 molar fraction n-C4 H9OH were measured by an adiabatic calorimeter in the temperature range from 78 K to 320 K. The functional relationships of heat capacity with respect to thermodynamic temperature were established. Glass-transition occurred at （111.9 ± 1.2） K. The phase transitions took place at （179.26±0.77） K and （269.69±0.14） K corresponding to the solid-liquid phase transitions of n-butanol and water, respectively. The phase-transition enthalpy and entropy of water were calculated. The thermodynamic functions of the binary systems relative to 298.15 K were derived based on the relationships of the thermodynamic functions and the function of the measured heat capacity with respect to temperature.