Journal ArticleDOI
Hydrazine: Heat Capacity, Heats of Fusion and Vaporization, Vapor Pressure, Entropy and Thermodynamic Functions
TLDR
In this paper, a vibrational assignment was made for spiropentane with the aid of detailed normal coordinate calculations, and the experimental values of C/sub p/, the heat capacity in the ideal gas state, may be represented by the equation: C/sup 0//sub p/ = -7.078 + 0.10850T - 4.799 x 10/sup -5/T/sup 2/.Abstract:
The heat capacity of spiropentane in the solid and liquid states was measured over the temperature range 12 to 298/sup 0/K. The melting point (166.14 +- 0.05/sup 0/K) and heat of fusion (1538 cal./mole) were determined. The heat of vaporization was measured at three temperatures, and the values found were 6753, 6572 and 6393 cal./mole, at 10.00, 25.00 and 38.98/sup 0/, respectively. The heat capacity of the vapor was measured at five different temperatures in the range 318 to 487/sup 0/K. The experimental values of C/sub p/, the heat capacity in the ideal gas state, may be represented by the equation: C/sup 0//sub p/ = -7.078 + 0.10850T - 4.799 x 10/sup -5/T/sup 2/. The vapor pressure was measured over the temperature range from 3 to 71/sup 0/, and the following equation was found to fit the vapor-pressure data: log/sub 10/p = 6.91794 - 1090.589/(t + 231.165). An equation for the second virial coefficient, B, in the equation of state PV = RT + BP was obtained from thermal data. This equation is B(cc.) = -57 - 136.7 exp(650/T). The entropy of liquid spiropentane is 46.29 = 0.10 cal./deg./mole, and the entropy of the vapor in the ideal gas statemore » at one atmosphere pressure is 67.45 = 0.15 cal./deg./mole, both at 298.16/sup 0/K. A vibrational assignment was made for spiropentane with the aid of detailed normal coordinate calculations. Using this vibrational assignment and other molecular structure data, values of the functions (H/sub 0//sup 0/ - F/sup 0//sub T/)/T H/sup 0//sub T/ - H/sub 0//sup 0/, S/sup 0/ and Cp/sup 0/ were computed for selected temperatures up to 1500/sup 0/K.« lessread more
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Journal ArticleDOI
Ammonia and related chemicals as potential indirect hydrogen storage materials
TL;DR: The saturation order of piecewise constant approximation in Lp norm on convex partitions with N cells is N−2/(d+1), where d is the number of variables as discussed by the authors.
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Phase Transition Enthalpy Measurements of Organic and Organometallic Compounds. Sublimation, Vaporization and Fusion Enthalpies From 1880 to 2015. Part 1. C1-C10
TL;DR: A compendium of phase change enthalpies including fusion, vaporization, and sublimation was published in 2010 as mentioned in this paper, which included organic, organometallic, and a few inorganic compounds.
Journal ArticleDOI
Vibrational spectrum of hydrazine-d sub 4 and a Raman study of hydrogen bonding in hydrazine.
TL;DR: A complete vibrational analysis based on band type, position, and depolarization values is given which satisfies the product rule for both the a and b vibrational symmetry species and indicates that part of the intensity of the 3189‐cm−1 band arises from a vibrational mode of the hydrazine monomer.
Journal ArticleDOI
On the Infrared Spectrum of Hydrazine
Paul A. Giguère,I. D. Liu +1 more
TL;DR: In this article, the absorption spectrum of hydrazine was reexamined in the region 1.5-25μ with a prism instrument and some twenty bands were found, some of which were appreciably different from previous data.
Journal ArticleDOI
The Infra-Red Spectrum of Hydrogen Peroxide
TL;DR: The absorption spectrum of hydrogen peroxide vapor was examined under low dispersion in the range 2-15µ as mentioned in this paper, and four bands were observed at 3590, 2630, 1255, and 877 cm^-1.