For a sample of perfect gas when its pressure is changed isothermally from pi to pf, the entropy change is given by
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a
ΔS=nRlnpfpi
b
ΔS=nRlnpipf
c
ΔS=nRTlnpfpi
d
ΔS=RTlnpipf
answer is B.
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Detailed Solution
For an ideal gas undergoing reversible expansion, when temperature changes fromTi to Tfand pressure changes from pi to pf,ΔS=nCplnTfTi+nRlnPiPf For an isothermal process, Ti=Tf so, ln1=0∴ΔS=nRlnPiPf