Comparison of the profile of activity coefficients for the mixtures Hexane/Heptane, Benzene/Toluene, 1-Porpanol/Isopropanol, Ethanol/Water, Ammonia/Water, and Carbon Dioxide/Water. The mixtures Hexane/Heptane, Benzene/Toluene, and 1-Porpanol/Isopropanol are generally regarded as ideal considering that their behavior can be predicted accurately with Raoult's Law. The activity coefficient was expected to be around 1 for both components of each mixture and this was confirmed by retrieving the data from Aspen Plus® v12, using the chemicals template and the non-random two-liquid model. The activity coefficients of the mixtures Ethanol/Water, Ammonia/Water, and Carbon Dioxide/Water were predicted with the chemicals template and the non-random two-liquid model, and the electrolyte template and the electrolyte non-random two-liquid property method. This latter approach was more suitable for aqueous solutions. In addition to the files of the simulation is Aspen Plus® v12, the MS Excel file and Origin plot were included to summarize the results.