apch20_practest - South Pasadena AP Chemistry Name Period...

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South Pasadena AP Chemistry Name _________________________________ Period ___ Date ___/___/___ 20 Entropy and Free Energy P R A C T I C E T E S T 1. Which of the following represents an increase in entropy? a) freezing of water b) boiling of water c) crystallization of salt from a supersaturated solution d) the reaction 2 NO(g) N 2 O 2 (g) e) the reaction 2 H 2 (g) + O 2 (g) 2 H 2 O(g) 2. The enthalpy of vaporization of methanol (CH 3 OH) is 35.3 kJ/mol at the boiling point of 64.2 ° C. Calculate the entropy change for methanol going from a liquid to vapor. a) 600. J/K·mol d) -105 J/K·mol b) 551 J/K·mol e) -551 J/K·mol c) 105 J/K·mol 3. Calculate the standard entropy change for the following reaction, Cu(s) + ½ O 2 (g) CuO(s) given that S ° [Cu(s)] = 33.15 J/K·mol S ° [O 2 (g)] = 205.14 J/K·mol S ° [CuO(s)] = 42.63 J/K·mol a) 195.66 J/K d) -93.09 J/K b) 93.09 J/K e) 195.66 J/K c) -45.28 J/K 4. In which of the following reactions do you expect to have a decrease in entropy? a) Fe(s) Fe(l) b) Fe(s) + S(s) FeS(s) c) 2 Fe(s) + 3/2 O 2 (g) Fe 2 O 3 (s) d) HF(l) HF(g) e) 2 H 2 O 2 (l) 2 H 2 O(l) + O 2 (g) 5. The formation ½ A 2
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