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Which of the following changes in states represent the smallest Delta S. Which has the largest Delta A. Explain

A. The freezing of water to ice
B. Melting of ice to liquid water
C. Sublimation of ice to gas


Off the cuff I would say C - sublimation of ice to gas.
The first two answers involve a single change of state...
Water to ice
Ice to water
But, ice to gas involves two changes of state..
ice to water to gas
What is Delta A?  What does that stand for?  I know about ∆H, ∆S and ∆G, but not sure I know about ∆A?
Also, I think Andrew M has it backwards.  Going from ice to water to gas would have the LARGEST ∆S.  The smallest ∆S would be freezing liquid water to ice as it represents a negative change in the value.
Some thermodynamics books use A as the symbol for the Helmholtz free energy.

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J.R. S. | Ph.D. in Biochemistry--University Professor--Chemistry TutorPh.D. in Biochemistry--University Profes...
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It just occurred to me that you meant to ask which has the smallest ∆S and which has the largest ∆S.  At least I think that's what you meant.  Already answered which is the largest in the "comment" section.  And the smallest.  Ice to gas would be the largest change in ∆S and water to ice would be the smallest (negative) change in ∆S.