Gibbs Energy and Entropy of Mixing in the NaNO2-KNO3 System

The activity and activity coefficients of the components of the NaNO₂-KNO₃ system, determined from the experimental data on the saturated vapor pressure at 798, 823, and 848 K, are used to calculate the relative and excess partial molar Gibbs energies (G _i and G _i ^{e x c}), entropies (S _i and S _i ^{e x c}), and integral relative and excess thermodynamic functions (G, G ^{e x c}, S, and S ^{e x c}) of the system.     

Saturated Vapor Pressure over the Melts of the NaNO2-NaNO3 System

The partial pressures of sodium nitrite and sodium nitrate over the system NaNO₂-NaNO₃ were determined at 798, 823, and 848°C. For sodium nitrate, A and B coefficients of the Clausius-Clapeyron equation, partial molar heats of vaporization, activities, and activity coefficients were calculated as functions of composition.     

Modification of epoxy-4,4′-isopropylidenediphenol resins with phosphorylated methacrylates for preparing compounds of the interpenetrating polymer network type

Phosphorylated methacrylates were prepared by reaction of butylphosphoric acids and their salts with glycidyl and β-chloroethyl methacrylates. The modifying properties of these substances toward epoxy-4,4′-isopropylidenediphenol resins ED-16 and ED-20 were examined. The physicochemical characteristics and heat resistance of the composites obtained were studied in relation to the structure of methacrylates, curing agent used, formulation, and curing conditions.     

Thermodynamic characteristics of the system NaNO<Subscript>2</Subscript>-NaNO<Subscript>3</Subscript>

The activities and activity coefficients of the components of the system NaNO₂-NaNO₃, obtained from experimental saturated vapor pressures measured at 798, 823, and 848 K, were used to calculate the total and excess partial molar Gibbs energies , , entropies , , and total relative and excess thermodynamic properties G, G ^ex, S, S ^ex of the system.Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 10, 2004, pp. 1747–1749.Original Russian Text Copyright © 2004 by Glazov, Dukhanin, Dkhaibe, Losev.     

Partial Pressure of Saturated Sodium Nitrite Vapor over the System NaNO2-NaNO3

The partial pressure of sodium nitrite was measured in the system NaNO₂-NaNO₃ at temperatures of 798, 823, and 848 K and the logarithm of the NaNO₂ pressure was obtained as a function of inverse temperature. The coefficients A and B of the Clausius-Clapeyron equation and the partial molar heats of evaporation were calculated. The activities and activity coefficients of sodium nitrite were determined for various compositions of the system NaNO₂-NaNO₃.