Exam2 - Name CHE104 Section 02(5 pts 1 State the Second Law...

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Name: ____________________________________ CHE104 Section 02 Exam2 (5 pts) 1. State the Second Law of Thermodynamics. 2. Consider the following 3 cases: ii) I place 1 ball in one of 1000 identical boxes. iii) I place 1 ball in one of 2 identical boxes. (5 pts) a) Which case (i, ii or iii) has the greatest S? (5 pts) b) Calculate S for case iii. (20 pts) 3. What is the total entropy change when 4 mol of water freezes at 0 oC in a freezer whose temperature is held at -30 oC?
4. State the Third Law of Thermodynamics. 5. A tank contains O 2 gas at 10 atm at 25 o C. (10 pts) a) Compute the molar entropy of the gas at 10 atm. (10 pts) b) Compute the change in entropy when a 0.1 mol sample of the gas is removed from the tank at 1 atm and 25 o C.
6. Consider the following reaction: 2 C 3 H 6 (g) + 2 NH 3 (g) + 3 O 2 (g) 2 C 3 H 3 N (l) + 6 H 2 O (l) (5 pts) a) Compute S o for the above reaction. (5 pts) b) Compute H o for the above reaction. (5 pts) c) Compute G o for the above reaction performed at 25 o C.

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