230_Sp10_Final Exam_key - CHEM 230 Sp 10 Final Exam p1...

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CHEM 230 Sp 10 Final Exam p1 Name:___________________ 1) ( 15 pts) The most common gases in the atmosphere are nitrogen, oxygen, argon, carbon dioxide, and water. Place and X in one box in each row for the best answer. N 2(g) O 2(g) Ar (g) CO 2(g) H 2 O (g) Smallest constant volume heat capacity X Largest value of van der Waals parameter a X Largest value of van der Waals parameter b X Lowest density assuming constant P and T X Highest v rms at the same T X 2) (6pts) Circle the sample that undergoes the greater change in entropy: ( Circle ONE answer.) A) a 10 g sample of a solid with a C s = 1 J/(g o C) initially at 25 o C heated for 5 minutes at a rate of 25 J/min B) a 10 g sample of the same substance with a C s = 1 J/(g o C) initially at 50 o C heated for 5 minutes at a rate of 25 J/min C) Both samples experience the same change in entropy 3) (6pts) Which sample has the higher increase in temperature? ( Circle ONE answer.) A) 2 moles of Ne at 1atm and 298K; 400 J heat are added under constant pressure B) 2 moles of Ne at 1atm and 298K; 400 J heat are added under constant volume C) Both samples have the same increase in temperature. 4) (8pts) A closed system initially at 298K, 4 atm, and 612 mL undergoes expansion until the pressure reaches 1 atm. a) Place a <, >, or = symbol in each box for the changes/quantities associated with each an isothermal and an adiabatic expansion. isothermal expansion adiabatic expansion b) (8pts) Find the reversible work that would accompany the isothermal expansion: n = PV RT = 4 atm (0.612 L ) 0.08206 Latm Kmol Λ Ν Μ Ξ Π Ο 298 K = 0.1 mol P 1 V 1 = P 2 V 2 4 atm (0.612 L ) = 1 atm ( V 2 ) 2.448 L = V 2 w = nRT ln V f V i = 0.1 mol 8.314 J Kmol Λ Ν Μ Ξ Π Ο (298 K )ln 2.448 L 0.612 L Λ Ν Μ Ξ Π Ο = 343.5 J q 0 > w 0 Δ T 0 Δ U 0 < = = q 0 = w 0 Δ T 0 Δ U 0 < < <
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CHEM 230 Sp 10 Final Exam p2 Name:___________________ 5) ( 18pts) Which of the following will change the vapor pressure of a liquid? ( Circle ALL that apply. There may be more than one correct answer. ) A) Increasing the amount of liquid in a rigid container at constant temperature B) Increasing the volume of a container at constant temperature (some liquid remains)
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This note was uploaded on 02/18/2011 for the course CHEMISTRY 230 taught by Professor Gottfried during the Spring '10 term at University of Michigan.

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230_Sp10_Final Exam_key - CHEM 230 Sp 10 Final Exam p1...

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