Let k be the Boltzmann constant. If the configuration of molecules in a gas changes from one with a multiplicity of M1 to one with a multiplicity of M2, then entropy changes by:
A. ?S = 0
B. ?S = k(M2 ? M1)
C. ?S = kM2/M1
D. ?S = k ln(M2M1)
E. ?S = k ln(M2/M1)
Answer: E. ?S = k ln(M2/M1)
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