March 16, 2006 - March 16, 2006 No net heat was added but...

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March 16, 2006
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No net heat was added but use heat converted to work and get entropy ΔS = q rev /T so q rev = TΔS There is heat in the molecules even though all the added heat was used to do work That’s happening????
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Q rev is a “latent” or hidden heat that is related not to the energy of the molecules. Instead it is related to a change in their randomness A increase from 1 to 10L means it will be more difficult to locate each atom In fact 10times as difficult
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Back to net work At T h RT h ln(10/l) heat was absorbed and used But RT h ln(10/l) is now “stored” as heat to keep maintain the additional randomness ΔS = Rln(10/1)
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• On compression at T c ., • RT c ln(1/10) of the “stored” random heat is released. The entropy change is equal and opposite to that at T h ΔS = RTln(1/10) But the random heat used is smaller SOME OF THE STORED “ENTROPIC” HEAT IS RELEASED AS WORK.
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Vaporization of a liquid at its boiling point
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This note was uploaded on 02/26/2012 for the course CHEM 108 taught by Professor Dr.brennan during the Spring '09 term at Binghamton University.

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March 16, 2006 - March 16, 2006 No net heat was added but...

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