Consider a system that undergoes a process from state 1 to state 2. During the p

Question

Consider a system that undergoes a process from state 1 to state 2. During the process, 100 kJ of heat is transferred to the system from the surroundings. The change in entropy of the system was calculated as -0.25 kJ/K. If the surrounding temperature is at 25 C, which one of the following statements is true? The process is,

a) Adiabatic

b) Isentropic

c) Reversible Adiabatic

d) Irreversible

e) Reversible

f) None of the above

I know the answer is f) (None of the above) but can you please explain why that answer is right and the others are wrong.

Explanation / Answer

Adiabatic process: No heat or mass transfer b/w system and surroundings.

Isentropic Process: entropy of the system is constant.

Revesible Adiabatic process: The process from state 1 to state 2 can also be reached from state 2 to state 1 without exchanging heat from the surrounding environment.

Reversible and Irreversible Process: A process which can be achived by infinitesimally slow changes to the system without increasing entrophy. Irreversibility can be caused by lack of equilibrim and also heat transfer b/w system and surroundings.

Now, in above question 100kj heat is transfered and entrophy of the systemis changed.

Hence, the answer is none of the above.

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