15 k2 3675 911020 kjkmol or kp 2 10 160 the calculated

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Unformatted text preview: le A28. The KP value for this reaction is practically zero, indicating that this reaction will not occur at this temperature. Discussion Note that this reaction involves one product (N) and one reactant (N2), and the stoichiometric coefficients for this reaction are nN 2 and nN2 1. Also note that the Gibbs function of all stable elements (such as N2) is assigned a value of zero at the standard reference state of 25C and 1 atm. The Gibbs function values at other temperatures can be calculated from the enthalpy and absolute entropy data by using the definition of the Gibbs function, g * 1T 2 h 1T 2 T s * 1T 2 , where h 1T 2 h * h T h 298 K. f EXAMPLE 162 Dissociation Temperature of Hydrogen Determine the temperature at which 10 percent of diatomic hydrogen (H2) dissociates into monatomic hydrogen (H) at a pressure of 10 atm. Solution The temperature at which 10 percent of H2 dissociates into 2H is to be determined. Assumptions 1 The constituents of the mixture are ideal gases. 2 The equilibrium mixture consists of H2 and H only. Chapt...
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This note was uploaded on 06/15/2009 for the course MAE 3311 taught by Professor Hajisheik during the Summer '08 term at UT Arlington.

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