Heats of hydrolysis and formation of potassium borohydride

Johnson, Walter H.; Schumm, Richard H.; Wilson, Isa H.; Prosen, E.J.

doi:10.6028/jres.065a.011

Cited by 5 publications

(3 citation statements)

References 8 publications

(11 reference statements)

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“…The volumetric behavior of the liquid phase of n-decane has been studied by Reamer and others (5). Likewise, the vapor pressure has been determined over a wide range of temperatures by Young (9), Reamer (5), and Willingham and coworkers (8). The volumetric data extend from a temperature of 40°to 460°F ., and the vapor pressures cover a similar range of temperatures.…”

Section: Direct Calorimetric Measurementsmentioning

confidence: 99%

Heats and Free Energies of Formation of the Alkali Aluminum Hydrides and of Cesium Hydride.

Smith¹,

Bass²

1963

J. Chem. Eng. Data

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possibility data in the region of low 1 / V must be available to determine the intercept precisely. This was not the case for 3-methylpentane, since the lowest density (1/ V) measured was 3.2 gram moles/liter at pressures of 41 and 55 atm., respectively.A certain amount of scatter was found when the reduced third virial coefficients for the isomeric hexanes were plotted against reduced temperature (Figure 2). This result was not surprising, since DaVid and Hamann (2) had found about the same degree of scatter (except the 'deviation of the 3-methylpentane points) for varied data in determining the solid line of Figure 2.Here again the greater deviation of the 3-methylpentane data is probably due to lack of low density compressibility data. NOMENCLATURE B = second virial coefficient, liter

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Section: Direct Calorimetric Measurementsmentioning

confidence: 99%

Heats and Free Energies of Formation of the Alkali Aluminum Hydrides and of Cesium Hydride.

Smith¹,

Bass²

1963

J. Chem. Eng. Data

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“…The Si02 was considered to exist in the form of MgSi 03 and a correction for 0.8 percent MgSi 03 was made. Shomate [40 ] reported SSgg to be 17.8 ±0.1 eu. Kelley and King [20] give S°gg = 17.82 ±0.10 eu.…”

Section: Beryllium-titanium Systemmentioning

confidence: 99%

“…Simon and Zeidler [43] and Todd [47] have reported heat-capacity measurements on all three of these substances. The natural minerals that were investigated by Todd [47] had the following analysis in weight percent: [40 ] (53°to 296°K) reported measurements of the heat capacity of magnesium metatitanate, MgTi 03 , prepared by "prolonged" heating of a stoichiometric mixture of MgO and Ti02 in vacuum at about 1300°C. X-ray diffraction patterns were reported to be in agreement with those previously published.…”

Section: Beryllium-titanium Systemmentioning

confidence: 99%

Preliminary report on the thermodynamic properties of selected light-element and some related compounds:

1962

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This is the seventh semi-annual report on the current experimental, theoretical, and evaluative program, at the National Bureau of Standards, on the thermodynamic properties of selected light-element compounds of primary interest in high-temperature research. In this connection the chemical elements principally involved are H, Li, Be, B, C, N, 0, F, At, Cl, and Zr, with more secondary interest in the compounds of Mg, Si, K, Ti, Br, I, W, Hg, and Pb. The emphasis in the NBS work has been on the simpler compounds of these elements.This report includes some recent NBS measurements under the program: The heat of formation of nitronium perchlorate, and the high-temperature heat capacity of aluminum carbide. As discussed in the report, precise measurements are essentially completed on the heat of combustion of aluminum in fluorine and on the low-temperature heat capacities and absolute entropies of LiH, and LiAlH^; however, these data are not yet presented, pending the resolution of small discrepancies needed to put the results on a final basis. Tables of thermodynamic functions are given for four gases omitted from earlier reports (H 2 > 02> H , and electron gas), and, on the basis of improved data, for the condensed phases of two substances (BeF 2 and At^C^) . A contribution from those areas in which elaborate apparatus development is still progressing is a description in the report of a new fast-opening large-aperture shutter for high-speed photography. This development will be important in the study of combustions at very high temperatures and pressures.Also included are several up-to-date literature surveys in the field.One describes recent additions to the literature on the chemistry of numerous light-element compounds. A second describes alloys and intermetallic compounds of aluminum and beryllium with titajaium and zirconium; while a third survey covers low-temperature heat capacities aud entropies of various substances, particularly the oxides of eight light elements. The fourth report is a comprehensive and critical assembly of the available values for the heats of formation of a large number of compounds. IntroductionNitronium perchlorate is a v;hite, crystalline material, stable at temperatures up to 120°C. It is extremely hygroscopic, reacting rapidly with water to form nitric and perchloric acids. Aqueous solutions of potassium hydroxide were used in this investigation, as the potassium salts of the acids provided more suitable reference substances. The heats of solution of KN0_(c) and KClO/c) in KOH(aq) were also determined. Constants and Conversion FactorsThe results of this investigation are given in joules and calories, with 1 cal = 4*1840 joules. All weights are corrected to vacuum. The molecular weights are calculated from the 1957 International Table of Atomic Weights [l]. For N02C10/(c) an estimated heat capacity of 36 cal/deg mole was used; other auxiliary data were taken where possible from [2].3. MaterialsThe KNO^(c) and KC10/(c) were reagent-grade materials, dried at 120°...

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