when does delta s surroundings equal 0 ?
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Re: when does delta s surroundings equal 0 ?
Hi,
The entropy of the universe does not change when the system in question is at equilibrium. In other words, if the states of the system are not changing, then there is also no effect on the surroundings.
Hope this helps. Cheers!
The entropy of the universe does not change when the system in question is at equilibrium. In other words, if the states of the system are not changing, then there is also no effect on the surroundings.
Hope this helps. Cheers!
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Re: when does delta s surroundings equal 0 ?
Because the change in the system affects the surrounding, if there is no change there then the delta s of the surroundings would also be 0!
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Re: when does delta s surroundings equal 0 ?
When the system is in equilibrium, there is no change in the entropy of the universe. If the system's states remain the same, there is no impact on the surroundings.
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Re: when does delta s surroundings equal 0 ?
Also! When in an adiabatic system (no exchange of heat btwn system and surroundings) then the delta H of surroundings is also 0, so delta S is 0 in that case too.
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Re: when does delta s surroundings equal 0 ?
At equilibrium, ∆Stot=0 because the process has no tendency to proceed in either direction. A spontaneous process would correspond to a positive ∆Stot, and if ∆Stot were negative, the reverse process would be spontaneous.
Also ∆Stot=0 when reversible work is done (it is max work because no energy is lost to the surroundings). ∆S of the system is the same whether the work is done reversibly or irreversibly, but ∆Stot is different for the two paths: ∆Stot=0 for the reversible path, and ∆Stot>0 for the irreversible path (heat lost to surroundings).
Also ∆Stot=0 when reversible work is done (it is max work because no energy is lost to the surroundings). ∆S of the system is the same whether the work is done reversibly or irreversibly, but ∆Stot is different for the two paths: ∆Stot=0 for the reversible path, and ∆Stot>0 for the irreversible path (heat lost to surroundings).
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Re: when does delta s surroundings equal 0 ?
In order for a system to not have an effect on the entropy of universe, it must be at equilibrium. This is because a change in the system makes a change in the surrounding, so the system must cease change for the entropy to remain stable. The system ceases change when it's at equilibrium.
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Re: when does delta s surroundings equal 0 ?
Hi,
Delta S is the change in entropy and signifies the direction of spontaneous change for a system. When delta S > 0, the reaction is spontaneous, and when delta S < 0, the reverse reaction is spontaneous, or the forward reaction is not spontaneous. Delta S only equals 0 for a reversible process.
Delta S is the change in entropy and signifies the direction of spontaneous change for a system. When delta S > 0, the reaction is spontaneous, and when delta S < 0, the reverse reaction is spontaneous, or the forward reaction is not spontaneous. Delta S only equals 0 for a reversible process.
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