Predict how the entropy of the substance is affected in each of the processes.

Question

A. H2O(l,300K)⟶H2O(s,273K)

B. O2(g,300K)⟶O2(g,800K)

C. Ar(l)⟶Ar(g)

Answer 1

A. solid ice has a more rigid structure; therefore, dS decreases.
B. O2 @ 800 K has more random ways to interact with each other; therefore, dS increases.
C. Your turn. In dS problems like this remember to look at the ransomness of the molecules.

Answer 2

So for C, dS would increase since gas form is less structured than liquid?

Answer 3

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