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应用微热量热仪测定了斯蒂芬酸(TNR)在溶剂N,N-二甲基甲酰胺(DMF)中不同浓度(b)时的溶解焓,用计算机拟合的方法求得计算该物质溶解焓(ΔsolH)的经验公式(ΔsolH=-14.392-988.6b+34.992b1/2)。由此得到了该物质的标准摩尔溶解焓(ΔsolHmθ=-14.392 kJ.mol-1),并分别推导出了TNR的相对表观摩尔焓、相对偏摩尔焓以及配合物的稀释焓的经验公式。同时,对TNR溶液反应的动力学进行了研究,通过分析热流对时间的曲线图,确定了该溶解反应的速率常数为1.632×10-3s-1,反应级数为0.6158。
The enthalpies of enthalpy of Stephenic acid (TNR) at different concentrations (b) in N, N-dimethylformamide (DMF) were determined by microcalorimetry. (ΔsolH) empirical formula (ΔsolH = -14.392-988.6b + 34.992b1 / 2). The standard molar enthalpy of solution (ΔsolHmθ = -14.392 kJ.mol-1) was obtained and the empirical formula of relative apparent molar enthalpy, relative partial molar enthalpy and dilution enthalpy of TNR were deduced. At the same time, the kinetics of the reaction of TNR solution was studied. By analyzing the curve of heat flux versus time, the rate constant of the dissolution reaction was determined to be 1.632 × 10-3s-1 and the reaction order was 0.6158.