ABSTRACT
The equilibrium state provides the direction toward which transient, or time-dependent processes progress. Often, the rate of progress toward equilibrium is assumed to be proportional to the difference between the state of a system, say S, and the equilibrium state, say S*. The effective mass transfer coefficient between the water and the air is 10 m/h. In order to assess the effects and implications of fate and transport processes such as chemical reaction and mass transfer it is necessary to develop a model that links them with the dynamics of a system. The basis for such a model is a material or mass balance first expressed by French scientist Lavossier. The use of any of the kinetic models depends on the ability to estimate the rate constants. Each of the kinetic models assumed that the reactions are irreversible.
