Equation Berthelot

Fig. 3.24 Test of the tensile strength hysteresis of hysteresis (Everett and Burgess ). TjT, is plotted against — Tq/Po where is the critical temperature and p.. the critical pressure, of the bulk adsorptive Tq is the tensile strength calculated from the lower closure point of the hysteresis loop. C), benzene O. xenon , 2-2 dimethyl benzene . nitrogen , 2,2,4-trimethylpentane , carbon dioxide 4 n-hexane. The lowest line was calculated from the van der Waals equation, the middle line from the van der Waals equation as modified by Guggenheim, and the upper line from the Berthelot equation. (Courtesy Everett.)...

There have been several papers on Ag oxalate— Ag2C204- Macdonald and Hinshelwood (Ref 7) confirmed the Berthelot equation, according to which the only products of decompn of Ag oxalate are metallic Ag and C02. Benton and Cunningham (Ref 9) found that the rate of thermal decompn of Ag oxalate may be increased by previously exposing it to ultraviolet radiation. During the thermal decompn of Ag oxalate, fragments of metallic Ag are formed. This has been confirmed by conductivity measurements (Ref 10) or by X-ray examination (Ref 11). Tompkins (Ref 1.2) investigated the thermal decompn of Ag oxalate at 110—130°. Its decompn, in his opinion, is similar to that of Ba azide... 

We need an equation of state for a real gas to calculate ASm. i. The modified Berthelot equation is often used for pressures near ambient and was used in the original reference to calculate the correction to ideal behavior for N gas.h This equation is as follows... 

The modified Berthelot equation is one that is often employed. It can be written in the form of a virial equation with... 

As expected, the modified Berthelot equation incorporates a linear relationship of r to pT and thus works only at low p. Even there the prediction is not exceptionally good.c... 

Berthelot Equation. This equation is too unwieldy to be used generally as an equation of state. However, it is convenient in calculations of deviations from ideality near pressures of 1 atm hence, it has been used extensively in the determination of entropies from the third law of thermodynamics. This aspect of the equation will receive more attention in subsequent discussions. 

Berthelot equation jpuYS chem A form of the equation of state which relates the temperature, pressure, and volume of a gas with the gas constant. ber to-lo... 

Equation (2) is given in Ref 8, p 161, where it is stated that Berthelot equation is derived from Clausius equation (See item... 

Thus it is similar to the decomposition of azides. There have been several papers on silver oxalate — Ag2C204. Macdonald and Hinshelwood [76] confirmed the Berthelot equation, according to which the only products of decomposition of silver oxalate are metallic silver and C02. 

BERTHELOT EQUATION. A form of the equation of state, relating the pressure, volume, and temperature of a gas, and the gas constant R. The Berthelot equation is derived from the Clausius equation and is of the form... 

Characteristic equations of this sort are also known as equations of state. See also Berthelot Equation. 

The van der Waals equation is not the only semiempirical equation of state for gases containing two constants. Another equation is the Berthelot equation ... 

Find the Boyle temperature for a gas obeying the Berthelot equation. 

The Berthelot equation has been found to be more accurate than the van der Waals equation for determining molar masses of gases. 

The second term on the right side of Eq. (1.130) represents the energy of molecular interactions per unit volume. As the volume increases, the interactions get smaller, as is the case for gases at low density. If we use the Berthelot equation... 

The Berthelot equation of state as applied to many gases reads... 

By a combination of this and the Berthelot equation, values of the equilibrium constant were found at several temperatures, and the dimerization enthalpy found from the usual log K vs. /T plot. 

Does the van der Waals or Berthelot equation of state satisfy the requirements of the Third Law Discuss the implications of your answer. 

Enthalpy of Formation Pohland (2) has studied the vaporization of SiBr from 260-426 K (0.8-755.5 mm Hg). This vapor pressure data (20 points) is corrected for vapor non-ideality by means of the equation AG /T -R In p - Bp/T. The Berthelot equation of state and critical constants T - 656 K and P 41.3 atm as suggested in the review article by Lapldus et al. (2) are used to calculate B. The recent study on orthobaric densities by Nisei son et al. ( ) reported T = 663 K. The use of this latter value does not signficantly affect the results. 

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