## 2013 Midterm Question 6B

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### 2013 Midterm Question 6B

Question 6B asks if based on the sign, we can tell the spontaneity of a reaction given a certain value. Two of the values it ask about are change in entropy and total change in entropy. The answer says for change in entropy we can not tell but for total change in entropy we can. How do we know that deltaS total is referring to the reaction's change in enthalpy rather than the universe and that deltaS is only referencing a specific step in the reaction and not the entire thing?

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### Re: 2013 Midterm Question 6B

It specifies "total change in entropy" in the problem so when you see this you should consider this as $\Delta S_{system}+\Delta S_{surroundings}$. The problem makes sure to differentiate between the two types and if another problem discusses total change in entropy, it will probably be explicitly stated.

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