摘要
用小样品全自动低温绝热量热计测量了甲苯在 78～ 35 0K温区的等压摩尔热容 .建立了摩尔热容与热力学温度的函数关系 .计算了热力学函数的变化量 [H(T) -H( 2 98.15K) ]和 [S(T) -S( 2 98.15K) ].根据Van’tHoff方程得到了甲苯的纯度 .
The low-temperature heat capacity of toluene was precisely determined by an automated adiabatic calorimeter over the temperature range from 78 to 350 K. The polynomial equations for the molar heat capacity of toluene with respect to the thermodynamic temperature were established through the least-squares fitting. The thermodynamic functions of toluene relative to temperature 298.15 K in the liquid phase were derived based on the relationships of thermodynamic functions. The mass fraction purity of the toluene used in the present calorimetric study was determined to be 99.51 mol% by fraction melting approach.
出处
《曲阜师范大学学报（自然科学版）》
CAS
2005年第1期70-72,84,共4页
Journal of Qufu Normal University(Natural Science)
基金
国家自然科学基金基金项目 (2 0 0 73 0 47)
关键词
绝热量热
低温
热容
甲苯
adiabatic calorimetry
low temperature
heat capacity
toluene
