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Discussion :: Chemical Engineering Thermodynamics

  1. The expression for entropy change given by, ΔS = - nR ln (P₂/P₁), holds good for

    2. A.

     Expansion of a real gas
    B.

     Reversible isothermal volume change
    C.

     Heating of an ideal gas
    D.

     Cooling of a real gas

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    Answer : Option B

    Explanation :

    We know S as a function of T and P as :
    dS=CPdTT−(∂V∂T)PdP
    For isothermal change dT=0   for ideal gas ∂V∂TP=nRP
    So, dS=−nRln(P2P1)
    For isothermal volume change of an ideal gas for both reversible and irreversible process.

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