H14_ Thermo 3-problems

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

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Unformatted text preview: 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 10.0 points 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 10.0 points 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( ℓ ) IV) 2 H 2 O( ℓ ) + O 2 (g) → 2 H 2 O 2 ( ℓ ) 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 10.0 points 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....
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This note was uploaded on 05/01/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas.

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

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