1.

For a sample of perfect gas when its pressure is changed isothermally from p_(i) to p_(f), the entropy change is given by

Answer»

`DeltaS=RTln((p_(i))/(p_(F)))`
`DeltaS=nRln((p_(f))/(p_(i)))`
`DeltaS=nRln((p_(i))/(p_(f)))`
`DeltaS=nRTln((p_(f))/(p_(i)))`

SOLUTION :`DeltaS_("sys")=nRln.(P_(i))/(P_(f))+nCpln.(T_(f))/(T_(i))`
In isothermal PROCESS `T_(i)=T_(f)`
`DeltaS_("sys")=nRln.(P_(i))/(P_(f))`


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