Homework 5key 3

Homework 5key 3 - Homework#5 Name 1 Predict the sign of the...

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Homework #5 Name: _______________ 1. Predict the sign of the entropy change of the system for each of the following reactions: a) 2SO 2(g) + O 2(g) 2SO 3(g) b) Ba(OH) 2(s) + 2H 2(g) BaO (s) + H 2 O (g) c) CO (g) + 2H 2(g) CH 3 OH (l) d) FeCl 2(s) + H 2(g) Fe (s) + 2HCl (g) 2. Use the appendix in the book to compare the entropies of the following gaseous hydrocarbons: methane, CH 4 ; ethane, C 2 H 6 ; propane, C 3 H 8 ; and butane, C 4 H 10 . What can you conclude about the trend in S as the number of carbon atoms increases? 3. (#32 Zumdahl) The enthalpy of vaporization of ethanol is 38.7 kJ/mol at its boiling point (78 °C). Determine S sys , S surr , and S univ when 1.00 mol of ethanol is vaporized at 78 °C and 1.00 atm.

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4. Calculate the standard entropy of reaction at 25 o C for each of the following reactions. Account for the sign of the entropy change in each case: a. 2 H 2 O 2 (l) 2 H 2 O (l) + O 2 (g) b. 2 Na (s) + Cl 2 (g) 2 NaCl (s) 5. Consider the oxidation of iron metal: 4 Fe (s) + 3 O 2 (g) 2 Fe 2 O 3 (s) . By determining Δ S univ , show that the reaction is spontaneous at 25 o C.
6. Consider the decomposition reaction:

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