E115_Problem_Set_5

E115_Problem_Set_5 - Determine the following: a) The final...

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e 115 Engineering Thermodynamics Fall 2009 University of California Problem set 5 Due: Monday, September 14 th , in lecture 1. (20 points) A horizontal cylinder is separated into two compartments by an adiabatic, frictionless piston. One side contains 0.2 m 3 of diatomic nitrogen and the other side contains 0.1 kg of monatomic helium, both initially at 20 ° C and 95 kPa. The sides of the cylinder and the helium end are insulated. Now heat is added to the nitrogen side from a reservoir at 500 ° C until the pressure of the helium rises to 120 kPa. Assume that both the nitrogen and helium behave as ideal gases with constant heat capacities and that changes of pressure and volume are done reversibly.
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Unformatted text preview: Determine the following: a) The final temperature of the helium. (4 points) b) The final volume of the nitrogen. (4 points) c) The molar heat capacity c V of the nitrogen, if the amount of heat transferred to the nitrogen, q in = 46.76 kJ. Express your answer as a multiple of R, the gas constant. (6 points) d) The entropy changes of i) the system, ii) the surroundings, and iii) the universe. Based on the entropy change of the universe, has this process been carried out reversibly? Justify/rationalize your answer. (6 points) He 0.1 kg N 2 0.2 m 3 Heat, q...
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This note was uploaded on 02/12/2011 for the course E 115 taught by Professor Staff during the Fall '08 term at University of California, Berkeley.

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