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T h e constant of proportionality is now the universal frequency. 1) cannot be proved. R a t h e r it will be assumed to hold, and experiment will decide whether the assumption is correct or not. 1) to hold true in the sense that the equilibrium constant is a constant only if activities a are used instead of concentrations c. 54 Chemical Kinetics of Elementary Steps Chap. 7) This very important relation, originally due to Brönsted and Bj err urn, has been demonstrated beautifully in the case of dilute strong electrolytes for which the theory of Debye-Hückel applies.

3 39 The Rate of an Elementary Step To vacuum The liquid vacuum. The liquid is in equilibrium with its vapor. 1 evaporates into Evaporation of a liquid. 4) Γ«>11 But the rate of collision of gas molecules with a surface is a familiar result of the kinetic theory of gases; the number of molecules striking a unit of surface area per unit time is proportional to the mean molecular velocity v and to the n u m b e r density c of molecules in the gas: fool! 5) = Again from kinetic theory of gases, it is recalled that the mean velocity of molecules in a gas is almost equal to the velocity of sound in the gas and is given by: .

Mazur, J. Chem. Phys. 35, 19 (1961).

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