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A system of 100 kg mass undergoes a process in which its specific entropy increases from 0.3 kJ/kg-K to 0.4 kJ/kg-K. At the same time, the entropy of the surroundings decreases from 80 kJ/K to 75 kJ/K. The process is:
  • a)
    Reversible and isothermal
  • b)
    Irreversible
  • c)
    Reversible
  • d)
    Impossible
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A system of 100 kg mass undergoes a process in which its specific entr...
Entropy increase in process = 100 (0.4 – 0.3) = 10 kJ/kg
Entropy change of surroundings = 5 kJ/K
Thus net entropy increases and the process is irreversible
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Most Upvoted Answer
A system of 100 kg mass undergoes a process in which its specific entr...
Explanation:

The process described in the question is an entropy change process. The system, which has a mass of 100 kg, undergoes a process in which its specific entropy increases from 0.3 kJ/kg-K to 0.4 kJ/kg-K. At the same time, the entropy of the surroundings decreases from 80 kJ/K to 75 kJ/K. The question asks whether the process is reversible and isothermal, irreversible, reversible, or impossible.

Irreversible Process:

The correct answer is option 'B', which states that the process is irreversible. This is because the entropy of the surroundings decreases during the process, which violates the second law of thermodynamics. The second law of thermodynamics states that the total entropy of the universe must always increase during any process. In this case, the entropy of the system increases, but the entropy of the surroundings decreases. This means that the total entropy of the universe has decreased, which is impossible according to the second law of thermodynamics. Therefore, the process must be irreversible.

Isothermal Process:

The question does not provide any information about the temperature of the system or the surroundings, so it is not possible to determine whether the process is isothermal or not. However, it is important to note that even if the process is isothermal, it can still be irreversible if it violates the second law of thermodynamics.

Reversible Process:

The process cannot be reversible since it violates the second law of thermodynamics.

Impossible:

The process is not impossible since the entropy of the system increases, which is allowed by the second law of thermodynamics. However, the decrease in entropy of the surroundings makes it an irreversible process.
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A system of 100 kg mass undergoes a process in which its specific entropy increases from 0.3 kJ/kg-K to 0.4 kJ/kg-K. At the same time, the entropy of the surroundings decreases from 80 kJ/K to 75 kJ/K. The process is:a)Reversible and isothermalb)Irreversiblec)Reversibled)ImpossibleCorrect answer is option 'B'. Can you explain this answer?
Question Description
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