sulfur undergoes a phase change from the rhombic crystal structure to the monoclinic form at 95.3 °C.

We need to use the Gibbs Free Energy equation....

G = H - TS (I've omitted the deltas, but assume they are there)

H = 0.202 KJ/mol = 202 J/mol

T = 273 + 95.3 = 368.3 K

Assume, G = 0 KJ/mol

So essentially, H = TS. Solving for S...

S = H/T = 202J/mol / 368.3 K

= 0.548 J/K/mol

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