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Discussion :: Chemical Engineering Thermodynamics

  1. The expression for entropy change, ΔS = n Cp . ln (T₂/T₁), is valid for the __________ of a substance.

    2. A.

     Simultaneous pressure & temperature change
    B.

     Heating
    C.

     Cooling
    D.

     Both B and C

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    Answer : Option D

    Explanation :

    Actually the Entropy of an ideal gas is given by:
    ΔS=∫TfTiCpdTT−nRln(PfPi).
    ⇒  it depends upon both temperature and pressure.
    Under constant pressure process we can write ΔS=cpln(TfTi).     The final temperature can be greater or lesser than the initial temperature.

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