Showing papers on "Standard molar entropy published in 1985"
TL;DR: Excess molar volumes are reported for [(1 − x )H 2 O + x CH 3 OH] from 0.1 MPa to 275 MPa at 278.15, 288, and 323.15 K as discussed by the authors.
31 citations
TL;DR: In this article, the reaction between atomic hydrogen and hydroxide ion in aqueous solution H + OH e/sub eq/ + H2O has been studied by pulse radiolysis and the activation energy of the reaction has been determined over the temperature range 15-60C as 6.3 +/- 0.6 kcal/mol (26.4 +/- 2.5 kJ/mol).
Abstract: The reaction between atomic hydrogen and hydroxide ion in aqueous solutions H + OH e/sub eq/ + H2O has been studied by pulse radiolysis. The rate constant was measured at pH 11.7 and 12 by following the growth of the hydrated electron absorption at 600 nm. The activation energy of the reaction has been determined over the temperature range 15-60C as 6.3 +/- 0.6 kcal/mol (26.4 +/- 2.5 kJ/mol). From this value and the activation energy of the reverse reaction, the e/sub aq/ enthalpy of formation H/sub f/ = -32.6 +/- 1.6 kcal/mol (-136.4 +/- 6.7 kJ/mol) and its standard entropy S = 16.7 +/- 5.4 cal/(mol deg) (69.8 +/- 22.5 J/)(mol deg)) were calculated. The high entropy of solvation S/sub s/ = 11.7 +/- 5.4 cal/(mol deg) (49 +/- 22.6 J/(mol deg)) when electrons are transferred from gas phase into aqueous solution indicates that the hydrated electron is a structure breaker. 28 references, 4 figures, 2 tables.
20 citations
TL;DR: In this paper, the thermodynamics of micelle formation by polystyrene-b-polyisoprene block copolymer in n-hexadecane, which is a selectively bad solvent for poly styrene, has been investigated.
20 citations
TL;DR: In this article, low-temperature (5 to 350 K) heat capcity, fluorine combustion, and high temperature (350 to 1500 K) drop-calorimetric measurements have been performed on a specimen of zirconium ditelluride ZrTe2.
15 citations
TL;DR: In this article, the lattice parameter and O/M ratio of the solid solution, CayU1−yO2+x, prepared in a stream of helium were investigated, and the single phase region of the cubic fluorite type solid solution extended from 0.03 to 0.33.
14 citations
TL;DR: In this paper, the authors measured vapour-liquid equilibrium pressures by a static method on (n-hexane + an α,ω-dichloroalkane) at 29815 K and calculated activity coefficients and excess molar Gibbs energies.
10 citations
01 Feb 1985
TL;DR: The thermodynamic properties of the hydrogen solution in amorphous Fe-Ti films (Ti: 43-60%) have been studied in the pressure range from 1 to 104 Pa and at temperatures from 293 to 623 K.
Abstract: The thermodynamic properties of the hydrogen solution in amorphous Fe - Ti films (Ti: 43–60%) have been studied in the pressure range from 1 to 104 Pa and at temperatures from 293 to 623 K. It is shown that the observed pressure-composition (PC) isotherms deviate positively from the Sievert's law, which is contrary to the negative deviation commonly observed in the hydrogen solution in crystalline compounds. In accordance with the positive deviation the relative partial molar enthalpies, - Δ H, derived from the isotherms decrease with increasing the hydrogen concentration, and at very dilute concentration the value is about three times larger than that for the formation of monohydride of crystalline FeTi. These anomalously large - Δ H values for hydrogen dissolution in amorphous Fe-Ti suggest that the local environment around the hydrogen atoms are quite different from that in crystalline FeTi. The relative partial molar entropy data are analyzed taking into account of the contribution from the vibrational and fromielectronic heat capacity and volume expansion terms. The results show that the number of interstitial sites available for hydrogen occupation at very dilute concentration is about five times smaller than the values observed in the V-, Nb-, Ta-H systems.
10 citations
TL;DR: In this paper, the authors used drop-calorimetric results to determine enthalpy increments relative to 298.15 K of NaLiSO4 and the heat capacity to 1200 K has been deduced from these results.
5 citations
TL;DR: In this article, a well-characterized specimen of rubidium chromate Rb 2 CrO 4 was reported and the standard molar enthalpies of solution and formation at 298.15 K are (25.99±0.06) and −(1410.76±1.90) kJ·mol −1, respectively.
4 citations
TL;DR: In this paper, the molar heat capacity of manganese hexafluorosilicate, MnSiF 6 · 6H 2 O, was measured from 7 to 305 K.
TL;DR: The heat capacity of the cubic form of potassium hexafluoroantimonate (V) has been measured from 21 to 284 K as mentioned in this paper, and there are no indications of any transition or thermal anomaly in this temperature range.