Lec 4 - Question from Last Time S = k ln(W) Which has the...

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1 1 S = k ln(W) Which has the larger entropy? A)NaF B) MgO Question from Last Time Energy available for populating states is proportional to the Kelvin temperature. Vibrational Energy Levels 2 Second Law of Thermodynamics S = k ln(W) The total entropy increases in any spontaneous process. Any spontaneous process results in an increase in the entropy of the Universe, i.e. an increase in the number of accessible microstates. Because dispersing the energy over the largest number of microstates is the most probable thing to occur by far!
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2 3 Second Law: S Universe > 0 for a spontaneous process. S universe = S system + S surroundings ice cube everything else (freezer) chemical everything else (calorimeter) reaction SUR SYS Energy, q 4 Second Law: S Universe > 0 S universe = S system + S surroundings If energy flows into the system, then the entropy of the system _____, and the entropy of the surroundings _____. A) increases, decreases B) decreases, increases C) doesn’t change, doesn’t change D) falls, rises SUR SYS Energy, q
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3 5 S = k ln(W) If all the possible energy has been removed from a system, and the system is in its lowest energy state, then the entropy of the system must be __________. A) large B) small C) zero 6 Third Law of Thermodynamics S = k ln(W) The entropy of a system approaches 0 as its temperature approaches 0 K. A pure, perfect crystal at 0 K has zero entropy. Only 1 state available to it.
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This note was uploaded on 06/20/2011 for the course CHEM 132 taught by Professor Laceyandhanson during the Spring '08 term at SUNY Stony Brook.

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Lec 4 - Question from Last Time S = k ln(W) Which has the...

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