Thermo%20_CMS_MCD_v6

Thermo%20_CMS_MCD_v6 - Thermodynamics Challenge Problem Nov...

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Unformatted text preview: Thermodynamics Challenge Problem, Nov. 7-13 Part I. Free energy and the direction of change Consider the now familiar reaction of the vaporization of water. H 2 O (l) ¡ H 2 O (g) Table 1 : ¡ H° f and S° values for water. H 2 O (g) H 2 O (l) ¡ H ° f (kJ mol-1 ) -241.8 -285.8 S ° (J mol-1 K-1 ) 188.8 69.9 1) Calculate ¡ H° rxn and ¡ S° from the values in the table above. 2) Using your answers from question 1, a) Fill in the Table 2 below. b) What trends do you notice for ¡ H°, ¡ S°, -T ¡ S° and ¡ G°? Explain your values. Table 2 : Temperature dependence for the vaporization of water T T (K) ¡ H °(kJ) ¡ S °(J/K)-T ¡ S °(J) ¡ G ° (kJ) 0°C 25°C 50°C 100°C 250°C 500°C 3) What conditions are optimal to make this reaction product favored? High T Low T never favorable always favorable 4) Make a plot of the ¡ H°, T ¡ S° and ¡ G° vs. T using your data in Table 2. 5) At what temperature does the reaction become product favored? Mark this point on your graph and explain your choice. What is significant about this...
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This note was uploaded on 06/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at Berkeley.

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Thermo%20_CMS_MCD_v6 - Thermodynamics Challenge Problem Nov...

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