[Fusiform]

Elemental sulfur can exist in two crystalline forms, rhombic and monoclinic. Calculate the temperature for the conversion of monoclinic sulfur to rhombic sulfur given the following data:

Substance   ΔHfº (kJ/mol)   Sº (J/K•mol)

S(rhombic)   0   31.73

S(monoclinic)   0.30   32.55


Help would be greatly appreciated with how to tackle this question. I have a feeling it is easy and I know how to do it but the answer and way is eluding me at the moment. Thanks in advance

[Yggdrasil]

What happens to the change in free energy when the rhombic and monoclinic forms are in equilibrium?

[Fusiform]

Is it just the difference in entropy - products - reactants???

[Yggdrasil]

Start with the definition for change in free energy (ΔG).

[tamim83]

You'll need the free energy of formation for these as well.  delta G for rhombic sulfur is 0kj/mol and for monoclinic it is 0.1kj/mol.