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Discussion :: Chemical Engineering Thermodynamics

  1. When dilute aqueous solutions of two salts are mixed, the process is associated with

    2. A.

     Decrease in temperature
    B.

     Increase in temperature
    C.

     No change in temperature
    D.

     Change in temperature which is a function of composition

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    Answer : Option B

    Explanation :

    According to the first law of thermodynamics
    δQ=dU+δW
    So, as there is no heat exchange and assuming no work is done w can write
    dU1(salt)+dU2(salt)=0⇒mCA(Tf−TA)=mcB(Tf−TB)So,Tf=mACATA+mBcBTBmAcA+mBcB
    So, the final temperature is dependent on concentration or composition.

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