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Bob D
Bob D
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"The change in entropy of a closed system is the same for any process between two specified states.".

The statement is correct. The reason is entropy is a state function. That means a change in entropy of the system between the same two equilibrium states is independent of the path between the states. Note emphasis on “system” since entropy generated may be passed to the surroundings in the form of heat.

However, if there is no heat transfer with the surrounding the process is adiabatic and any entropy generated due to irreversible work will be retained in the system. In this special case a reversible adiabatic process and irreversible adiabatic process cannot connect the same two equilibrium states.

To calculate the entropy changegenerated for an irreversible adiabatic process you need to assume any convenient reversible path between the two states, which will necessarily not be adiabatic, and apply the entropy definition. You can do this because the entropy change of the system is independent of the path.

Hope this helps

"The change in entropy of a closed system is the same for any process between two specified states.".

The statement is correct. The reason is entropy is a state function. That means a change in entropy of the system between the same two equilibrium states is independent of the path between the states. Note emphasis on “system” since entropy generated may be passed to the surroundings in the form of heat.

However, if there is no heat transfer with the surrounding the process is adiabatic and any entropy generated due to irreversible work will be retained in the system. In this special case a reversible adiabatic process and irreversible adiabatic process cannot connect the same two equilibrium states.

To calculate the entropy change for an irreversible adiabatic process you need to assume any convenient reversible path between the two states, which will necessarily not be adiabatic, and apply the entropy definition. You can do this because the entropy change of the system is independent of the path.

Hope this helps

"The change in entropy of a closed system is the same for any process between two specified states.".

The statement is correct. The reason is entropy is a state function. That means a change in entropy of the system between the same two equilibrium states is independent of the path between the states. Note emphasis on “system” since entropy generated may be passed to the surroundings in the form of heat.

However, if there is no heat transfer with the surrounding the process is adiabatic and any entropy generated due to irreversible work will be retained in the system. In this special case a reversible adiabatic process and irreversible adiabatic process cannot connect the same two equilibrium states.

To calculate the entropy generated for an irreversible adiabatic process you need to assume any convenient reversible path between the two states, which will necessarily not be adiabatic, and apply the entropy definition. You can do this because the entropy change of the system is independent of the path.

Hope this helps

Source Link
Bob D
Bob D
  • 77.9k
  • 6
  • 58
  • 152

"The change in entropy of a closed system is the same for any process between two specified states.".

The statement is correct. The reason is entropy is a state function. That means a change in entropy of the system between the same two equilibrium states is independent of the path between the states. Note emphasis on “system” since entropy generated may be passed to the surroundings in the form of heat.

However, if there is no heat transfer with the surrounding the process is adiabatic and any entropy generated due to irreversible work will be retained in the system. In this special case a reversible adiabatic process and irreversible adiabatic process cannot connect the same two equilibrium states.

To calculate the entropy change for an irreversible adiabatic process you need to assume any convenient reversible path between the two states, which will necessarily not be adiabatic, and apply the entropy definition. You can do this because the entropy change of the system is independent of the path.

Hope this helps