Heats of mixing for 21 ternary systems of one n‐alkane + two n‐alcohols are reported at 25°C. Evaluation of four equations permitting the prediction of heats of mixing of ternary systems from binary data is made. Scatchard's modified equation for systems containing a polar component was found to be the most accurate.

Heats of mixing for 21 ternary systems of one n‐alkane + two n‐alcohols are reported at 25°C. Evaluation of four equations permitting the prediction of heats of mixing of ternary systems from binary data is made. Scatchard's modified equation for systems containing a polar component was found to be the most accurate.

A new semi‐continuous dilatometer which does not have the major drawbacks of the previous model was designed, constructed and tested, using the systems benzene‐cyclohexane and cyclohexane‐ethanol. The volumes of mixing of five systems made of n‐alcohols and cyclohexanc: were determined at 25°C.

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