Benzene thermal expansion coefficients

The volume anomalies are also reflected in Figure 29.13(c), which shows the thermal expansion coefficient = (l/V)OV/3T)p, the temperature derivative of the partial molar volume (Figure 29.13(b)). Water is anomalous for a < 0, which occurs in the cold liquid state. For most materials a is positive at all temperatures. For example, Figures 9.2 and 9.5 show that the molar volumes of polyethylene, benzene, and other liquids increase monotonicaUy with temperature. 

The calculation of TCF in multicomponent systems has been done only for spherical cavities with the formalism developed by Lebowitz et al. Methods IV and V can in principle be extended for TCF calculation for nonspherical cavities in multicomponent systems. An artificial binary system (benzene-water) was selected here to illustrate the computational methodology. In practice, these two solvents mix very little, and their mixture can be of little interest, but they are quite different in their chemical nature and this makes such a system interesting. The method is by no means limited to certain mixtures and is universally applicable to any mixture if the molecular and physical parameters of the pure components are known (hard sphere diameter, number density, thermal expansion coefficient, dielectric constant). Figure 9 displays TCF calculated as a function of solvent mole fractions for a spherical cavity of cyclohexane size created in a hypothetical water-benzene mixture. Gc (Figure 9) increases with the increase of water mole fraction, but there is little difference between pure benzene and a mixture containing around 50% water as far as solvation of cyclohexane is concerned. 

Fig. 13. Effect of the solvent solubility parameter 8 on the linear coefficient of thermal expansion 3 (1) and modulus of elasticity E (2) of films of linear SBS thermoelastoplastics with 28.3% PS obtained from solutions. The solvent is indicated on the abscissa axis I — n-heptane, II — tetra-hydrofurane, III — benzene, IV — chlorobenzene 119)...

Properties Colorless, mobile liquid becomes yellowish under the action of light and air. Fruitlike odor (high dilution). Decomposed by water. Attacks brass but not iron (dry). D 1.742 (14C), bp 156C (decomposes), fp —65C, coefficient of thermal expansion 0.0011, vap d 6 (air = 1.29), volatility 20,000mg/m3(20C), vap press 2.29 mm Hg (21.5C). Soluble in alcohol, benzene, ether, and water. Derivation Chlorination of ethyl arsenious oxide. Hazard Toxic by ingestion, inhalation, and skin absorption strong irritant. 

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