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Discussion :: Chemical Engineering Thermodynamics

  1. The expression, ΔG = nRT .In P₂/P₁ , gives the free energy change

    2. A.

     With pressure changes at constant temperature
    B.

     Under reversible isothermal volume change
    C.

     During heating of an ideal gas
    D.

     During cooling of an ideal gas

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    Answer : Option A

    Explanation :

    We know, the property relation:
    dG=vdp−sdT
    Which is valid for both reversible and irreversible process since it is a property relation. when the system undergoes isothermal change dT=0
    So, dG=vd⇒dG=nRTPdP(for, ideal gas)
    On, integration
    ⇒ΔG=nRT.lnP2P1
    So, for a system containing ideal gas and undergoing isothermal change of volume or pressure this expression is valid.

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