ABSTRACT

The enthalpies of dilution of aqueous solutions of acetamide, propionamide and butyramide were determined as a function of the molar fraction at 293.15 K, 298.15 K, 303.15K and 308.15K by flow microcalorimetric measurements. The enthalpies of dilution of amides are compared with literature data when available and the results are discussed in terms of solute solvent interactions. The enthalpic interaction coefficients were obtained according to the McMillan Mayer theory. The addition of a CH2 group causes an important change in the interaction coefficients. The pairwise coefficients increase as the number of CH2 groups increase. Two additivity approaches are used in this work: the Savage Wood principle and a simple methylene additivity approach. The results obtained by both methods are presented and compared with literature data.

Compounds

#	Formula	Name
1	C2H5NO	ethanamide
2	C3H7NO	propanamide
3	C4H9NO	butanamide
4	H2O	water

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1 4	Molar enthalpy of dilution, kJ/mol ; Liquid	Temperature, K; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Pressure, kPa; Liquid	Liquid	Flow calorimetry	40
POMD	2 4	Molar enthalpy of dilution, kJ/mol ; Liquid	Temperature, K; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Pressure, kPa; Liquid	Liquid	Flow calorimetry	48
POMD	3 4	Molar enthalpy of dilution, kJ/mol ; Liquid	Temperature, K; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Pressure, kPa; Liquid	Liquid	Flow calorimetry	48

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Enthalpy of dilution of aliphatic amides in aqueous solutions at temperatures between 293.15K and 308.15K

Romero, C. M.[Carmen M.], Gonzalez, M. E.[Maria E.], Lamprecht, I.[Ingolf]

ABSTRACT