2017 Final Exam.pdf - BMEN 3315 Fall 2017 Final Exam(100...

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Page 1 of 15 BMEN 3315 Fall 2017 Final Exam (100 pts Total) Name: _________________________________ Question 1. (2 pts). What is the correct spelling of Arrhenius? a. Hareenius b. Reneus c. Arrhenius d. Arrheniusay Question 2. (5 pts) Consider the change of state of 1 mole of pure water from Point 1 to Point 2 on the single-component phase diagram below. The change of state is at a constant pressure of 1 bar; T 1 at Point 1 is -50 o C; and T 2 at Point 2 is 50 o C. Necessary thermodynamic data are provided in the handout. a. How much heat is required in the change of state from Point 1 to Point 2?
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Page 2 of 15 b. What is the change in entropy of the water for the change of state from Point 1 to Point 2? Question 3. (3 pts) In answering Question 2, you made an implicit assumption that the heat flow and enthalpy change are equal under the constant pressure constraint. Please prove this assumption is correct.
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Page 3 of 15 Question 4. (10 pts) Consider a system comprising one mole of an ideal monatomic gas undergoing an isothermal two-step change of state as shown by the figure and data below. The temperature is 300 K. The two steps are as follows: Step 1. The gas under goes a reversible isothermal compression from Point 1 to Point 2. Step 2. The gas undergoes an irreversible expansion from Point 2 back to Point 1. a. What is the change in entropy of the gas in Step 1? b. What is the change in entropy of the surroundings in Step 1. Volume/liter Pressure/bar 20 1.247 19 1.313 18 1.386 17 1.467 16 1.559 15 1.663 14 1.782 13 1.919 12 2.079 11 2.267 10 2.494 0.000 0.500 1.000 1.500 2.000 2.500 3.000 5 10 15 20 25 Pressure, bar Volume, liters 2 1
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Page 4 of 15 c. What is the change in entropy of the gas in Step 2?
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