When solid melts...? a)entropy will increase b)entropy will decrease

1 Answer
Truong-Son N.
Apr 16, 2018

Well, what did you pick? I said the entropy will increase, due to absorbing heat.

When a solid melts, intermolecular forces loosen up and the liquid phase will form... and as liquids have more degrees of freedom (rotational, to be specific) and mobile intermolecular interactions, they have more entropy.

Case in point...

#S^@("H"_2"O"(s)) = "47.95 J/mol"cdot"K"#
Derived from: http://www1.lsbu.ac.uk/water/water_properties.html

#S^@("H"_2"O"(l)) = "69.95 J/mol"cdot"K"#
https://webbook.nist.gov/cgi/cbook.cgi?ID=C7732185&Mask=2#Thermo-Condensed

From this data, what is #DeltaS_"fus"^@# for water?

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