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[" For a sample of perfect gas when its ...

[" 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=nR ln((p_(f))/(p_(i)))quad " (b) "Delta S=nR ln((p_(t))/(p_(f)))],[" (c) "Delta S=nRT ln((p_(f))/(p_(t)))" (d) "Delta S=RT ln((p_(i))/(p_(f)))]]

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