9.73 and delta S tot

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9.73 and delta S tot

Postby ClaireHW » Tue Feb 13, 2018 10:51 pm

How does delta S tot determine spontaneity?
I am confused to the difference between delta S and delta S tot.

(Claire Woolson Dis 1K)

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Re: 9.73 and delta S tot

Postby Cooper1C » Wed Feb 14, 2018 12:29 pm

The third law of thermodynamics says that the total entropy is always increasing, so delta S total must be positive. The standard enthalpy for a reaction can be positive or negative depending on the reaction. For example, building polymers from monomers has a negative delta S (the complexity is increasing), but breaking down polymers to form monomers has a positive delta S (the complexity is decreasing).

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