中文摘要：

利用Anton Paar DMA4500振动管密度计，测量了293．15K时二元体系C6H6-DMF（苯-N，N-二甲基甲酰胺）溶液的密度，利用最小二乘法确立了溶液密度与组成的函数关系．利用密度数据分别计算了二元体系中C6H6和DMF的表观摩尔体积，并利用非线性最小二乘拟合法，分别拟合得到了优化的C6H6和DMF的表观摩尔体积和摩尔分数的函数关系，以及C6H6和DMF的表观摩尔体积和质量分数的函数关系．通过对函数关系的极限运算得到了C6H6和DMF的标准偏摩尔体积和摩尔体积．此外，还计算了不同组分下体系的超额摩尔体积，数据可用四参数Redlich-Kister方程很好地关联拟合，得到方程系数及体系的超额摩尔体积极值位置．

英文摘要：

The densities of binary solution C6H6-DMF （benzene-N,N-dimethylformamide） at 293.15 K were measured by use of the Anton Paar vibrating-tube ：densimeter, the molar fractions of benzene for the binary solution is from 0 to 1. The apparent molar volumes of C6H6 and DMF in the binary system C6H6-DMF were separately calculated from the density data, and the optimized dependences between apparent molar volumes and molar fractions and mass fractions were also determined, respectively, by the nonlinear least-square Re- gression, and further more, the standard partial molar volumes and the molar volumes of C6H6 and DMF were also obtained from the functions limits. At the same time, the excess molar volumes for the binary solution were calculated and were fitted by the fourth-order Redlich-Kister equation well, so the Redlieh-Kister coeffi- cients and the excess molar volume extremum were obtained.