The heats of mixing for binary mixtures of n-butyl amine with water, methyl alcohol, ethyl alcohol, n-propyl alcohol, and n-butyl alcohol at 40.00 ± 0.01 °C determined in a twin-type calorimeter can be fitted in an equation of the form AHmwhere x2 is the mole fraction of n-butyl amine; Xi is the mole fraction of the second component; B, C, and D are constants. The mixing is accompanied by evolution of heat, and the exothermic effect follows the order CH3OH > H20 > C2H5OH > n-C3H7OH > n-C4H9OH.As part of our program of research to investigate the effect of a gradual change in the size and shape of the substituent hydrocarbon group on the thermodynamic properties of a mixture of highly polar liquids, we present the results of studies on the heats of mixing of n-butyl amine with water, methyl alcohol, ethyl alcohol, n-propyl alcohol, and n-butyl alcohol.

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