H14_ Thermo 3-problems

H14_ Thermo 3-problems - chang(cc45524 H14 Thermo 3...

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chang (cc45524) – H14: Thermo 3 – mccord – (51600) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This is your LAST homework on Quest for CH301. 001 10.0points Consider the following processes. (Treat all gases as ideal.) I) The pressure of one mole of oxygen gas is allowed to double isothermally. II) Carbon dioxide is allowed to expand isothermally to 10 times its original vol- ume. III) The temperature of one mole of helium is increased 25 C at constant pressure. IV) Nitrogen gas is compressed isothermally to one half its original volume. V) A glass of water loses 100 J of energy reversibly at 30 C. Which of these processes leads to an increase in entropy? 1. V 2. I and II 3. III and V 4. II and III 5. I and IV 002 10.0points For the four chemical reactions I) 3 O 2 (g) 2 O 3 (g) II) 2 H 2 O(g) 2 H 2 (g) + O 2 (g) III) H 2 O(g) H 2 O( ) IV) 2 H 2 O( ) + O 2 (g) 2 H 2 O 2 ( ) which one(s) is/are likely to exhibit a positive Δ S ? 1. II only 2. All have a positive Δ S . 3. I and II only 4. III and IV only 5. I, III and IV only 003 10.0points For the evaporation of water from an open pan at 25 C, the values of Δ S for the water, the surroundings, and the universe must be, respectively, 1. None of these is correct. 2. positive, negative, positive. 3. positive, negative, zero.
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