CHM 132 - Final - 2003

CHM 132 - Final - 2003 - Chemistry 132 Final Examination...

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Chemistry 132 Final Examination May 8, 2003 Name ( PRINT) __________________________ Workshop Leader________________________ There are 10 questions on this exam. The last two pages of this exam contain a Periodic Table and a list of constants and formulas. Show your work neatly and circle your answers. Give units for all answers requiring them. Score Part 1 1. (45 points)_____________ 2. (30 points)_____________ subtotal __________________ Part 2 3. (25 points)_____________ 4. (25 points)_____________ 5. (25 points)_____________ subtotal __________________ Part 3 6. (35 points)_____________ 7. (40 points)_____________ subtotal __________________ Part 4 8. (20 points)_____________ 9. (20 points)_____________ 10. (35 points)_____________ subtotal __________________ Grand total (300 max) __________________
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Name_________________________ 2 1. (45 points) Consider an ideal gas for which, in the temperature range of interest, C P is constant and equal to 30.0 J mol -1 K -1 . (a) The temperature of 1.00 mol of the gas, contained in a cylinder with a piston exerting a constant pressure of 1.00 atm, is raised gradually and reversibly from 500 to 1000K. Calculate V, q, w, E, H, and S for this sample of gas.
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Name_________________________ 3 1. (continued) (b) Suppose the same change of state described in (a) had been carried out irreversibly. Explain how V, E, H, and S for the gas would differ (if at all) from the values obtained in (a).
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Name_________________________ 4 2. (30 points) The following thermodynamic cycle has been developed by a brash engineer from Texas, who claims that he can "roll up his sleeves and fix that Carnot cycle." He calls his process the Perot cycle, and it is summarized below: Process AB: Irreversible expansion of one mole of ideal gas at a constant external pressure of 1 atm from a volume of 20 L to 40 L. The gas is heated in this process from 300 K to a temperature T B . Process BC: reversible cooling of the gas at constant volume until the temperature is lowered to 300 K. Process CA: reversible isothermal compression of the gas at 300 K from a volume of 40 L to its original volume of 20 L. (a) Calculate the work done on the system in the process AB . Pay attention to the sign of the result. (b) Calculate the work done on the system in the reversible isothermal compression, process CA. Pay attention to the sign of the result.
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Name_________________________ 5 2. (continued) (c) Calculate the net work done on the system over the entire cycle (d) Based on your knowledge of the Perot cycle and the Carnot cycle, do you think the Perot cycle can be more efficient than the Carnot cycle? Why or why not?
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Name_________________________ 6 3. (25 points) Speciation of metal ions is a very important issue in aqueous resources.
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CHM 132 - Final - 2003 - Chemistry 132 Final Examination...

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