Question

A fluid transfers 2000 kJ of heat to the environment, which is at 27 C. If...

A fluid transfers 2000 kJ of heat to the environment, which is at 27 C. If the entropy change for the fluid is -5 kJ/k, the overall process is:

(a)Possible and reversible

(b)Possible and irreversible

(c)Impossible

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Answer #1

Ans: (b) Possible and irreversible.

Entropy change of the surroundings

Where Q = heat exchanged with the surroundings, here Q = -2000 kJ, Tsur = 300 K

Therefore, Ssur = 6.67 kJ K-1

Since Ssyt = -5 kJ/K (Given)

Total entropy S = Ssur + Ssyt = 1.67 kJ/K

For a spontaneous process S 0 ,

For a reversible process S =0.

Hence the process is irreversible and spontaneous

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