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The excess enthalpies of all possible binary mixtures of n‐heptane, isooctane (2,2,4‐trimethylpentane), ETBE (ethyl‐tert. butyl ether) and ethanol have been measured at 298.15 K and 313.15 K and atmospheric pressure using a quasi‐isothermal flow calorimeter. The experimental excess enthalpies HE and published excess heat capacities CEP and excess volumes VE are used to test the applicability of the ERAS (Extended Real Associated Solution)‐model.

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Calorimetry 1 Excess Properties f Liquid Mixtures 1 ThermodynamicsMolar excess enthalpies H E have been measured for ternary mixtures of methanol + MTBE + n-heptane and for the three corresponding binary mixtures of these compounds using a quasi-isothermal flow calorimeter. The measurements have been performed at atmospheric pressure and at 298.1 and 313.1 K. The experimental results are compared with those calculated using the ERAS-(Extented Real Associated Solution) model and the NRTL-equation.