The specific (cp ) and molar (Cp) heat capacities of dilute aqueous solutions of methanol (MeOH), ethanol (EtOH),
1-propanol (n-PrOH) and 2-propanol (i-PrOH) were measured using an adiabatic calorimetry at T = 298.15 K and
ambient pressure. Based on the obtained results, the excess molar heat capacities, CEp , as well as the apparent
molar heat capacities of each of components, Cp,∅,1(2), of the system {water (1) + alkanol (2)} were calculated.
The standard (at infinite dilution) Cop,2 values were also estimated. All the CEp values are positive and pass through
maxima, which shift to the range of a lower mole fraction of alcohol, x2 , when the molecular weight of the latter
increases. The same goes for the Cp,∅,1 (max) values, too. In turn, the order of changing Cp,∅,2 (max) within the
narrow high-diluted range of (~0.01 < x2 < 0.035) m.f. is oppositely directed. It is established that the x2 value
at dCEp /dx2 = 0 is approximately half of the sum of the x2 values at Cp,∅,1 (max) and Cp,∅,2 (max), a fact indicating
the parity contribution of both interacting components of the solution to the structure-energy transformations
occurring in it.
