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Example text
If DH 0 is more negative, then the field of oxide and oxygen enlarges and that of the metal and oxygen diminishes. Thus, the stability of oxide increases. 9: The Gibbs free energy changes for the formation of CoO and MnO as a function of temperature. 2005 11:55am 34 Evaporation Therefore, eq PO 2 & ' DH 0 À TDS0 DH 0 ¼ constant  exp : ¼ exp RT RT (2:47) The equilibrium oxygen pressure depends exponentially on temperature, and since DH 0 is negative, it decreases, as the enthalpy of reaction becomes more negative.
KB ¼ Boltzmann constant. 2005 11:55am Evaporation 59 indicates that it is the motion of the molecules and not the forces between them that dominate their macroscopic behavior. The results of this theory enable us to understand not only thin film deposition process by evaporation but also many other relevant aspects of vacuum technology. The term vacuum is generally used to denote a region in which the pressure of the gas is less than that of the atmosphere (1:013 Â 105 Pa). 1. Calculation of Pressure The simplest description from the kinetic theory of gases is an explanation of the pressure exerted by a gas on the walls of its container.
It is therefore possible to express to a good approximation DGT ffi DH298 À TDS298 : (2:35) A similar equation can also be written for a reaction in which both the reactants and products are in their standard states (that is, all the reactants and products are at unit activity), so that 0 À TDS0298 : DG0T ffi DH298 (2:36) DGT as a function of temperature T, results in a straight-line plot if the approximation is valid. 2005 11:55am 30 Evaporation which is the negative of the entropy change that occurs because of the chemical reaction.
