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Practice Exam IV Fall 2004

Practice Exam IV Fall 2004 - Practice Exam IV 1 Calculate...

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Practice Exam IV 1) Calculate the heat required to melt 10.0 grams of ice (originally at 0.0°C) and then heat the water to 25° C. ΔH fus for ice = 6.02kJ/Mol Specific Heat of liquid water is 4.184 J/g K 2) Calculate ΔH° for the reaction 2Al(s) + 3Cl 2 (g) 2AlCl 3 (s) From the following data: 2Al(s) + 6HCl(aq) 2AlCl 3 (aq) + 3H 2 (g) ΔH° = -1049 kJ HCl(g) HCl(aq) ΔH° = -74.8 kJ AlCl 3 (s) AlCl 3 (aq) ΔH° = -323 kJ And ΔH f ° of HCl(g) = -922.5 kJ 3) Predict which material has a higher entropy and explain your reasoning a) A solid, paramagnetic metal at 298 K with NO permanent magnetic field present (other than that of the earth which we can ignore for this question) b) The same solid, paramagnetic metal at 298 K in the presence of a large magnetic field from a nearby electromagnet 4) Consider the reaction: H 2 (g) + CO(g) HCHO(g) ΔH° = 1.96 kJ/mol ΔS° = -109.58 J/K a) Calculate ΔG° at 298 K b) Determine the temperature, if any, at which the reaction would become spontaneous.
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