Problems are listed in approximate order of difficulty. A single dot (•) indicates straightforward problems involving just one main concept and sometimes requiring no more than substitution of numbers in the appropriate formula. Two dots (••) identify problems that are slightly more challenging and usually involve more than one concept. Three dots (•••) indicate problems that are distinctly more challenging, either because they are intrinsically difficult or involve lengthy calculations. Needless to say, these distinctions are hard to draw and are only approximate.
• Consider Example 15.6 in which a gas is allowed to expand from a volume V0 into a volume 2V0 when a barrier is broken. Using both of the methods given in that example, find the change in entropy if the gas is allowed to expand in this way from volume V0 to 3V0.
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