Speeds of sound, densities, and isentropic compressibilities of {xc-C6H12+(1−x)C6H5CH3}, {xc-C6H11CH3+(1−x)C6H6}, and {xc-C6H11CH3+(1−x)C6H5CH3}, from 293.15 to 303.15 K

Thermodynamic properties of (an alkylbenzene + cyclohexane) at the temperature 298.15 K

“…were neglected in the calculation of isothermal compressibility and isochoric molar heat capacity because they are about 10 −6 ·K −1 (maximum: 3.9·10 −6 K −1 ) for (toluene+cyclohexane) (10) which value causes only 2 TPa −1 on isothermal compressibility as seen in figure 5 and only 0.2 J·K −1 ·mol −1 on isochoric heat capacity as seen in figure 6. For (benzene+cyclohexane), (12) a E is also about 10…”

“…The excess molar volumes of the mixtures lie in the sequence: benzene (4) q toluene (10) q ethylbenzene q propylbenzene q 1-methylethylbenzene, which are arranged along with the increase of the molar volume, as found in figure 3. The larger the molar volume is, V T , according to restricted rotation because of a non-smooth sphere contrary to the smooth spherical benzene.…”

“…FIGURE 6. Excess molar isochoric heat capacities at T=298.15 K. w, {xC6H5C2H5+(1−x)c-C6H12}; q, {xC6H5CH2CH2CH3+(1−x)c-C6H12}; r, {xC6H5CH(CH3)CH3+(1−x)c-C6H12}; --, a E =0 and ---, a E $0, (10) {xC6H5CH3+(1−x)c-C6H12}; --, a E =0 and ----, a E $0,…”

Topological Investigations of Excess Molar Volumes and Excess Isentropic Compressibilities of Ternary Mixtures Containing Pyrrolidin-2-one at 308.15 K

“…The speed of sound was determined at a frequency of 2 MHz using a quartz crystal interferometer (Model-M 80, Mittal Enterprises, New Delhi, India). The measuring cell was a specially designed double-walled cell, in which water was circulated to maintain the temperature at (308.15 ± 0.01) K. The speed-of-sound values for the component liquids at (298.15 ± 0.01) K (recorded in Table 1) is compared with their corresponding experimental values [22][23][24][25]. The uncertainty in the measured speedof-sound measurements is 1 m · s −1 .…”

Comments on “Acoustic and Thermodynamic Properties of Binary Liquid Mixtures of Benzaldehyde in Hexane and Cyclohexane” by S. Azhagiri, S. Jayakumar, R. Padmanaban, S. Gunasekaran, and S. Srinivasan

“…The interpretation by the authors that "the decrease of κ S and L f , and also the increase in R a and Z, with increasing mole fraction of benzaldehyde in both liquid systems indicates the presence of molecular interactions between unlike molecules" does not seem right. It is well known that when two liquid components having largely different properties are mixed, significant variation in the properties is bound to occur, either a decrease or an increase, depending upon the properties of the individ- [10] 1054 [9] 650.18 [7] Cyclohexane 1202 1229.1 [11] 790 769.04 [10] 1230 [12] 768.45 [7] ual components. In this particular case, when benzaldehyde having a low compressibility To analyze the molecular interactions, it is important to know the size of these decreases.…”