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For a sample of perfect gas when its pre...

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

A

`Delta S= RT ln ((p_(i))/(p_(f)))`

B

`Delta S = nR ln ((p_(f))/(p_(i)))`

C

`Delta S= nR ln ((p_(i))/(p_(f)))`

D

`Delta S= nRT ln ((p_(f))/(p_(i)))`

Text Solution

Verified by Experts

The correct Answer is:
C
`Delta S_("sys") = nR "ln " (P_(1))/(P_(2)) + n Cp "ln " (T_(2))/(T_(1))`
In isothermal process `T_(1)= T_(2)`
`Delta S_("sys") = nR "ln " (P_(i))/(P_(f))`
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