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Question

Which of the following expressions regarding entropy is incorrect?
  1. Stotal=Ssystem+Ssurrounding
  2. Ssystem=Stotal+Ssurrounding
  3. S= SfinalSinitial
  4. Ssystem=qrevT
    where, q is the heat energy of the system


Solution

The correct option is B Ssystem=Stotal+Ssurrounding
Entropy is a measure of randomness or disorderness of the system.
The total entropy change is the sum of entropy change of the system and the surrounding:
Stotal=Ssystem+Ssurrounding

The thermodynamic definition of entropy is based on the expression:
Ssystem=qrevT

Since, entropy is a state function, it is measured as the difference in the final and the initial state of the system.

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