Constants for Gases

The constants for various gases are listed in Table 4.2, where 

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Table 5.27 Compressibility of Water Table 5.28 Mass of Water Vapor In Saturated Air Table 5.29 Van der Waals Constants for Gases Table 5.30 Triple Points of Various M aterlals 5.9.1 Some Physical Chemistry Equations for Gases...

Osburn, J.O., Markovic, P.L. Calculating Henry s Law Constant for Gases in Organic Liquids, ... 

Table IV shows that potassium and sodium salts have been studied much more extensively than ammonium salts. However, we found that, for any one gas, differences in the coefficient between potassium and ammonium salts of the same anion and between sodium and ammonium salts of the same anion are nearly constant. For gases other than carbon dioxide, we have used data on bromides, chlorides, nitrates, and sulfates from a single investigator to obtain average differences (Table V). For carbon dioxide, such data were not available, and we used averages of results on chlorides, nitrates, and sulfates from different investigators.

Khodakovskiy (16) used this assumption to extrapolate dissociation constants for acids, Henry s law constants for gases and solubility products for salts. In a variation of this technique Khodakovskiy (17) has extrapolated partial molal heat capacities of ions and neutral molecules by using C = bT. 

IAPWS, Guideline on the Henry s Constant and Vapor-Liquid Distribution Constant for Gases in H20 and D20 at High Temperatures, The International Association for the Properties of Water and Steam, Kyoto, Japan (2004)... 

The fluid density plays an important role in fluid mechanics. For an incompressible fluid (e.g., a liquid), the density may often be treated as a constant. For gases, however, one... 

The same conclusion may be obtained from the study of the behavior of many gases adsorbed on charcoal. We shall discuss the mobility of adsorbed molecules in Sec. VII, but we may mention here one of the results of such studies. Many gases, such as A, N2, 02, CO, CH4, etc., when adsorbed on charcoal, behave as two-dimensional nonideal gases (44)- This behavior can be described by a two-dimensional van der Waals equation, from which a two-dimensional van der Waals constant o2 (comparable with the normal three-dimensional van der Waals a) may be derived. The two-dimensional van der Waals constants can also be calculated from the three-dimensional values of a (45). The experimental results show that the actual a2 constants for gases adsorbed on charcoal or on mercury are always far lower than the theoretical ones and are very often even negative (45). The adsorbed molecules tend to repel each other instead of showing a mutual attraction. This behavior also points to a polarization of the adsorbed molecules by the field of the charcoal or of the mercury (47). 

Table 10.1 Henry s Constants for Gases Dissolved in Water at 298.15 K (25°C)...

Calculate the collision frequency, mean free path, and diffnsion constant for gases (Section 9.8, Problems 65-66). 

The equilibrium constant for gases, Kp, expresses the relationship of the equilibrium partial pressures (in atm). 

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