Sulfur undergoes a phase transition between 80 and 100C S 8 (rhombic) S 8 (monoclinic) r H 3 213 kJ mol rxn r S 8 7 J K mol rxn (a) Estimate r G for the transition at 80 0C and 110 0C What do these results tell you about the stability of the two forms of sulfur at each of these temperatures (b) Cal...

The Gibbs free energy change AG can be calculated using the equation AGAHTAS where A H is the standa ...

Sulfur undergoes a phase transition between 80 and 100C. S 8 (rhombic) S 8 (monoclinic)

Question:

Sulfur undergoes a phase transition between 80 and 100°C.
S₈(rhombic) → S₈(monoclinic)
Δ_r H° = 3.213 kJ/mol-rxn Δ_r S° = 8.7 J/K ∙ mol-rxn
(a) Estimate Δ_rG° for the transition at 80.0°C and 110.0°C. What do these results tell you about the stability of the two forms of sulfur at each of these temperatures?
(b) Calculate the temperature at which Δ_rG° = 0. What is the significance of this temperature?