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Unformatted text preview: THERMODYNAMICS II QUESTION 1 Values of some thermodynamic parameters for Br 2 , Cl 2 and BrCl at 298 K are given below. Material ∆ f H ê / kJ mol-1 S ê / J K-1 mol-1 Br 2 (l) 0 152.3 Cl 2 (g) 0 223.0 BrCl(g) 14.69 239.9 a) Why are the enthalpies of formation of chlorine and bromine equal to zero? b) Calculate ∆ r H ê and ∆ r S ê for the reaction at 298 K. c) Comment on the value you have obtained for ∆ r S ê . d) Calculate ∆ r G ê and K p for the reaction at 298 K. e) Explain how a change in (i) pressure and (ii) temperature might affect the relative amounts of reactants and products at equilibrium. f) Discuss the effect that a catalyst for this reaction would have on the rate of the forward and reverse reactions and on the position of equilibrium. QUESTION 2 In the Haber process, ammonia is produced by passing a mixture of nitrogen and hydrogen over a catalyst: N 2 (g) + 3H 2 (g) → 2NH 3 (g) The standard enthalpies of formation, standard entropies, and heat capacities are given in the table below for...
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This note was uploaded on 05/09/2010 for the course CHE 3051 taught by Professor Sitimachmud during the Spring '08 term at National Central University.
- Spring '08