Transport and acoustic properties of pentyl acetate with butanol at 298.15 K to 318.15 K: Singh model and ab-initio approach.

The viscosity ($\eta $η) and speed of sound ($u$u) of binary pentyl acetate (1) + isomers of butanol (2) mixtures were reported at <italic>T</italic> = 298.15 K to 318.15 K and at 0.1 MPa pressure. Using the experimental data, deviation in viscosity ($\Delta \eta $Δη), deviation in speed of sound ($\Delta u$Δu), and excess isentropic compressibility (${\kappa _s}^E$κsE) were determined and these were fitted with the RK equation. The findings suggest that the behaviour of a mixture is affected by intermolecular interactions (dipole – dipole, H – bonding, dispersive, and cohesive force) and structural aspects of the molecule. The $\Delta \eta $Δη and ${\kappa _s}^E$κsE curves were predicted well with the Singh model and ab – initio approach. At each temperature, the ${\kappa _s}^E$κsE values were positive for binary mixtures, whereas the $\Delta \eta $Δη and $\Delta u$Δu values were negative. The numeric values of $u$u were determined through numerous correlations. This study delves into the relative importance of these relations with the experimental values of $u$u. [ABSTRACT FROM AUTHOR]