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Abstract Ultrasound velocities (u) and densities (ρ) for the binary mixtures of flavoured compounds viz. butylethanoate and 3-methylbutyl ethanoate and several hydrocarbons viz. cyclohexane, benzene,1,4-dimethylbenzne and 1,3,5-trimethylbenzene have been measured at 308.15K. Adiabatic compressibilities (βad), acoustic impedances (Z) and available volumes (Va) for all the mixtures have also been evaluated at entire concentration range. Ultrasound velocities increase as mole fractions of hydrocarbons increase in all the binary systems. Adiabatic compressibilities decrease with increase in volume fractions of hydrocarbons for the binary mixtures of ethanoates with aromatic hydrocarbons while it increase first, reaches a maximum values at around 0.6-0.7 mole fractions of cyclohexane and then decrease for the binary mixtures of ethanoates and cyclohexane. Deviations in ultrasound velocities (Δu) and in adiabatic compressibilities (Δβad) from the linear blending rule have been reported for all the studied binary mixtures. The results are discussed in terms of the unlike molecular interactions present in the binary systems. Key words: Ultrasonic velocities, flavoured compounds, binary liquid mixtures, adiabatic compressibilities.
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