Gchem help!!

[han1425]

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maximum entropy is seen in a system when which of the following is occuring?

• • CHANGE IN GIBBS FREE ENERGY IS ZERO
  • CHANE IN GIBBS FREE ENERGY IS POSITIVE
  • CHANGE IN GIBBS FREE ENERGY IS NEGATIVE
  • CHANGE IN ENTHALPY IS NEGATIVE
  • CHANGE IN ENTROPY IS NEGATIVE

the answer says it's A.
no idea how to breakdown this question.

 

[sixkiller]

maximum entropy is seen in a system when which of the following is occuring?

• • CHANGE IN GIBBS FREE ENERGY IS ZERO
  • CHANE IN GIBBS FREE ENERGY IS POSITIVE
  • CHANGE IN GIBBS FREE ENERGY IS NEGATIVE
  • CHANGE IN ENTHALPY IS NEGATIVE
  • CHANGE IN ENTROPY IS NEGATIVE

the answer says it's A.
no idea how to breakdown this question.

In general, macrocopic systems tend to reach maximum entropy at equilibrium.

Remember, that entropy in the strictest sense has to do with the number of possible configurations; this is usually the greatest at equilibrium (the change in free energy is zero at equilibrium)

Once the system is at equilibrium, no additional work can be done; in other words, there is no other state that it can go to because it is at equilibrium, therefore the change in gibbs free energy is zero.

Just keep in mind that the TOTAL change in entropy at equilibrium in zero.