The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 at 27°C is to a volume of 100 dm3
∆s=nRlnv2v1
=2.303 nR logv2v1 = 2.303×2×8.314×log10010 = 38.3 J mol-1k-1
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