scholarly journals The critical constants and orthobaric densities of xenon

1912 ◽  
Vol 86 (591) ◽  
pp. 579-590 ◽  
Keyword(s):  
Equation Of State ◽  
Boiling Point ◽  
Periodic Table ◽  
Atomic Weight ◽  
Atomic Volume ◽  
Liquid Xenon ◽  
Rare Gases ◽  
Critical Constants

Rudorf, in a paper on the rare gases and the equation of state, has drawn attention to the high value found by Ramsay and Travers for the density of liquid xenon at its boiling point. As is well known the atomic volume in any group of elements in the periodic table either increases regularly with rise of atomic weight or remains approximately constant, so that it is to be expected that the atomic volume of xenon would be greater than of krypton, since the value for krypton exceeds that of argon. If Rudorf's calculated value for the density of neon is taken into account, this anomaly becomes more striking, as is shown from the following table taken from his paper:-

Critical consolute point in hard-sphere binary mixtures: Effect of the value of the eighth and higher virial coefficients on its location

2010 ◽  
Vol 75 (3) ◽  
pp. 359-369 ◽  
Author(s):  
Mariano López De Haro ◽  
Anatol Malijevský ◽  
Stanislav Labík
Keyword(s):  
Equation Of State ◽  
Binary Mixtures ◽  
Hard Sphere ◽  
Hard Spheres ◽  
Virial Coefficients ◽  
Fluid Mixture ◽  
Binary Fluid ◽  
Virial Series ◽  
Consolute Point ◽  
Critical Constants

Various truncations for the virial series of a binary fluid mixture of additive hard spheres are used to analyze the location of the critical consolute point of this system for different size asymmetries. The effect of uncertainties in the values of the eighth virial coefficients on the resulting critical constants is assessed. It is also shown that a replacement of the exact virial coefficients in lieu of the corresponding coefficients in the virial expansion of the analytical Boublík–Mansoori–Carnahan–Starling–Leland equation of state, which still leads to an analytical equation of state, may lead to a critical consolute point in the system.

The Seven Last Infra-Uranium Elements to Be Discovered

2019 ◽  
Author(s):  
Eric Scerri
Keyword(s):  
Periodic Table ◽  
Atomic Weight ◽  
Weak Acid ◽  
Ray Method ◽  
Natural Sources ◽  
Transuranium Elements ◽  
X Ray ◽  
Naturally Occurring ◽  
Missing Element

The term “infra-uranium,” meaning before uranium, is one that I have proposed by contrast to the better-known term transuranium elements that are discussed in the following chapter. The present chapter concerns the last seven elements that formed the missing gaps in the old periodic table that ended with the element uranium. After Moseley developed his X-ray method, it became clear that there were just seven elements yet to be isolated among the 92 naturally occurring elements or hydrogen (#1) to uranium (#92). This apparent simplicity is somewhat spoiled by the fact that, as it turned out, some of these seven elements were first isolated from natural sources following their being artificially created, but this raises more issues that are best left to the next chapter of this book. The fact remains that five of these seven elements are radioactive, the two exceptions being hafnium and rhenium, the second and third of them to be isolated. The first of the seven final infra-uranium elements to be discovered was protactinium, and it was one of the lesser-known predictions made by Mendeleev. In his famous 1896 paper, Mendeleev indicated incorrect values for both thorium (118) and uranium (116). (See figure 1.6.) A couple of years later, he corrected both of these values and showed a missing element between thorium and uranium (figure 4.4). In doing so, Mendeleev added the following paragraph, in which he made some specific predictions. . . . Between thorium and uranium in this series we can further expect an element with an atomic weight of about 235. This element should form a highest oxide R2O5, like Nb and Ta to which it should be analogous. Perhaps in the minerals which contain these elements a certain amount of weak acid formed from this metal will also be found.. . . The modern atomic weight for eka-tantalum or protactinium is 229.2. The apparent inaccuracy in Mendeleev’s prediction is not too surprising, however, since he never knew that protactinium is a member of only four “pair reversals” in the entire periodic table.

PRELIMINARY STUDY OF THE FRACTIONATION OF ISOTOPIC ISOMERS BY DISTILLATION

1935 ◽  
Vol 13b (2) ◽  
pp. 114-121 ◽  
Author(s):  
D. F. Stedman
Keyword(s):  
Vapor Pressure ◽  
Boiling Point ◽  
Atomic Weight ◽  
Liquid Oxygen ◽  
Vapor Pressures ◽  
Normal Concentration ◽  
Short Run ◽  
Total Separation ◽  
Preliminary Study

Slight separations of some isotopic isomers have been achieved by equilibrium rectification. In the case of chlorine the total separation amounted to 0.048 atomic weight units; 28.6% of the O18 has also been removed from normal oxygen by the fractionation of water, and in a short run with liquid oxygen the normal concentration of O18 has been raised from 0.2% to 0.25%. The last-mentioned separation can be carried considerably further with present equipment.CH3D was synthesized. Its boiling point appears to be 0.5 °C. lower than that of methane.The vapor pressures of a 56.8% solution of D2O were measured, and it is suggested that the published values of the vapor pressure of D2O at temperatures lower than 40 °C. may be slightly too high.

An experimental study of the equation of state of liquid xenon

1973 ◽  
Vol 5 (5) ◽  
pp. 633-650 ◽  
Author(s):  
W.B. Streett ◽  
L.S. Sagan ◽  
L.A.K. Staveley
Keyword(s):  
Experimental Study ◽  
Equation Of State ◽  
Liquid Xenon

scholarly journals Modeling the properties of Kukersite shale gasoline

2021 ◽  
Author(s):  
Parsa Mozaffari ◽  
zachariah Steven baird ◽  
oliver järvik
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Vapor Pressure ◽  
Prediction Model ◽  
Boiling Point ◽  
Gasoline Fraction ◽  
Shale Oil ◽  
Property Prediction ◽  
Density Data ◽  
Do So

Based on new experimental data for Kukersite shale oil, it is now possible to develop a property prediction model for the gasoline fraction of shale oil. Such a model was created based on estimation of the composition along with experimental boiling point and density data. First, correlations were developed to estimate the composition of a Kukersite shale gasoline sample based on the boiling point and density of narrow fractions. The estimated composition was then used with the PC-SAFT equation of state to calculate the properties of shale gasoline. To do so, correlations were developed to predict the PC-SAFT parameters of the various classes of compounds present in Kukersite shale gasoline. The utility of this model was shown by predicting the vapor pressure of various portions of the shale gasoline.

1. Note on some Numerical Relations between the Specific Gravities of the Diamond, Graphite, and Charcoal Forms of Carbon and its Atomic Weight

1862 ◽  
Vol 4 ◽  
pp. 241-248 ◽  
Author(s):  
Lyon Playfair
Keyword(s):  
Atomic Weight ◽  
Atomic Volume ◽  
Important Chemical ◽  
Intimate Relation ◽  
Forms Of Carbon ◽  
Image Position

Recent researches have shown that there is an intimate relation between the specific gravities and atomic weights or equivalents of solid and liquid bodies. This relation is not so simple as that which prevails in regard to the volumes and combining numbers of gaseous bodies, and yet it is sufficiently marked to indicate many important chemical analogies. The formula for eliciting these relations is—in which E is the equivalent, d the specific gravities, and V the atomic volume.

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