Application of the extended real associated solution (ERAS) theory to excess molar enthalpies of benzaldehyde + 1-alkanols (C1 to C5) at T = 298.15 K

Highlights: → Enthalpy of binary mixtures of {benzaldehyde + 1-alkanols} (C1 to C5) determined. → Excess molar enthalpy, partial molar enthalpy, and intermolecular interaction functions were calculated. → Excess molar enthalpy was correlated as a function of mole fraction by using the Redlich-Kister equation. → The experimental results have been used to test the applicability of the ERAS-model, Wilson and NRTL equations. - Abstract: This paper reports excess molar enthalpies, HmE, for the binary mixtures of {1-alkanols (2), namely, {methanol, ethanol, 1-propanol, 1-butanol, and 1-pentanol} with benzaldehyde (1)} at T = 298.15 K at ambient pressure over a whole range of mole fraction. The sign of HmE for all systems are positive and the magnitude of HmE values with increasing of chain length, increase. The Redlich-Kister polynomial equation was used to correlate HmE. The excess partial molar enthalpies of benzaldehyde, Hm,1E, excess partial molar enthalpies of 1-alkanols (C1 to C5), Hm,2E, and excess partial molar enthalpies at infinite dilution, Hm,iE,0, are calculated according to experimental excess molar enthalpies and Redlich-Kister polynomial equation. The extracted date were used to evaluated the so-called intermolecular interaction functions ∂Hm,iE/∂xi and ∂Hm,iE/∂xj in terms of enthalpy. The ERAS, Wilson and NRTL models have been applied for describing the HmE.