Question

# Which of the following expressions regarding entropy is incorrect?△Stotal=△Ssystem+△Ssurrounding△Ssystem=△Stotal+△Ssurrounding△S= Sfinal−Sinitial△Ssystem=qrevT where, q is the heat energy of the system

Solution

## The correct option is B △Ssystem=△Stotal+△SsurroundingEntropy 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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