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Densities and surface tensions were measured for the binary liquid mixtures formed by formamide, N-methylacetamide, di-methylformamide, and di-methylacetamide with acetonitrile at 293.15, 298.15, 303.15, and 313.15 K and atmospheric pressure over the whole concentration range. The Prigogine–Flory–Patterson model, the Ramaswamy and Anbananthan model, the model devised by Glinski, the Sanchez equation, the Goldsack relation, and the Eberhart model were used to predict the associational behaviour of weakly interacting liquids. The measured properties were fitted to the Redlich–Kister polynomial relation to estimate the binary coefficients and standard errors. Furthermore, the McAllister multibody interaction model was used to correlate the binary properties. These nonassociated and associated models were compared and tested for different systems showing that the associated processes yield fair agreement between theory and experiment compared with nonassociated processes.

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