Question
Rhombic sulphur transforms to monoclinic sulphur at 95.5C with an enthalpy change of 96 cal/mole. Test the validity of the third law of thermodynamics for
Rhombic sulphur transforms to monoclinic sulphur at 95.5C with an enthalpy change of 96 cal/mole. Test the validity of the third law of thermodynamics for this transition from the following data: i. Cp of rhombic sulphur at -258C = 0.3 cal/deg/mole. ii. Area under the curve drawn between CP/T and T for rhombic sulphur between T = -258C and T = 95.5C is 8.71 cal/deg/ mole. iii. For monoclinic sulphur: S368.5 So = 9.07 cal/deg/mole, where S368.5 and So are the entropies at 95.5C and -273C respectively. Assume that the entropy contribution of rhombic sulphur below -258C (15 K) follows Debye's equation.
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