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Unformatted text preview: University of California Santa Barbara, Department of Chemical Engineering ChE 210A: Thermodynamics and Statistical Mechanics Problem set #2 Due: Friday, October 9, 2009 Objective: To become familiar with the thermodynamic entropy, its derivatives, and its connection to microscopic, molecular properties; and to understand the principle of entropy maximization. 1. Statistical antics. If you could have only one of these superpowers, which would it be? (1) teleportation you can instantly transport yourself to anywhere, (2) telekinesis you can move small objects with your mind, (3) mind reading, (4) psychic ability you can foresee events in the future, and (5) invisibility. 2. Conceptual problem (3 points). Consider the following system of two compartments of an ideal gas which are linked by a moveable, insulating, impermeable wall: Thus the compartments can exchange volume, while the total volume g G g g is conserved. a) Assume that each box can be subdivided into very small cells of volume ; each cell serves as one particular location where one or more ideal gas particles can be placed. Find an expression for the density of states of the system in terms of , , ,g G and . Neglect energies. b) Find an expression for the value of , and hence g , that maximizes the density of states. c) What happens if the volume is just slightly different than its value at the density of states maximum? Consider another value of g , given by g 0.9999g where g is the value found in part b. Determine the base-10 logarithm of the ratio of the number of microstates at the two volumes, lo0.9999g /g . Take and to be 1 10 and 2 10 . Given that all microstates are visited equally, what does this result imply for the frequency with which the volume 0.9999g will be seen, relative to g ?...
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This document was uploaded on 05/18/2010.
- Spring '09