Find the change in entropy for the following processes and explain your result P

Question

Find the change in entropy for the following processes and explain your result

Process

?S

(positive/ negative/ equal to zero/ anything is possible )

Explanation (show equation if necessary)

Adiabatic irreversible

Adiabatic reversible

Reversible heat addition

Reversible heat rejection

Irreversible heat rejection

Irreversible heat addition

Process

?S

(positive/ negative/ equal to zero/ anything is possible )

Explanation (show equation if necessary)

Adiabatic irreversible

Adiabatic reversible

Reversible heat addition

Reversible heat rejection

Irreversible heat rejection

Irreversible heat addition

The entropy change for a process is given by the equation below: s-s,-s,-f+5gan Sge. 0 tor reversible process 0 for irreversible process 0 for ffreversible process

Explanation / Answer

0 S=dQ/T, in adiabatic process, dQ=0

0    S=dQ/T, in adiabatic process, dQ=0

positive     S=dQ/T, dQ is positive if heat is added

negative     S=dQ/T, dQ is negative if heat is rejected

negative S=dQ/T, dQ is negative if heat is rejected

positive S=dQ/T, dQ is positive if heat is added

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