A Solid Elemental Sulfur Exists In Two A Lotropes A Sulfur Rhembici Anc B Sulfur Monoclinic The Molar Entropies O 1 (23.65 KiB) Viewed 30 times
(a) Solid elemental sulfur exists in two a lotropes, a-sulfur (rhembici anc B-sulfur (monoclinic). The molar entropies of une iwa allutrapes are 31.81 K mol' lur 2- sulfur, and 32.6 J <¹ mol for B-sulfur (et 298 Kl. The entha oy change for the conversion of a safe to ß-sulfur à 3.30 Freud'. For the purposes of una question, you may assume that these values are independent of temperature. By computing the entropy change of the Universe for the above process, determine which allotrope is the stable form at 50 °C.. e) Determine the temperature at which the cwu allotropes are in equilibrium, and the al otrope which is favoured at temperatures higher than this. (412.5 K
(a) Solid elemental sulfur exists in two allotropes, a-sulfur (rhombic) and B-sulfur (monoclinic). The molar entropies of the two allotropes are 31.8 J K-¹ mol-¹ for a- sulfur, and 32.6 J K-¹ mol-¹ for B-sulfur (at 298 K). The enthalpy change for the conversion of a-sulfur to B-sulfur is 330 J mol-¹. For the purposes of this question, you may assume that these values are independent of temperature. By computing the entropy change of the Universe for the above process, determine which allotrope is the stable form at 50 °C. (b) Determine the temperature at which the two allotropes are in equilibrium, and the allotrope which is favoured at temperatures higher than this. [412.5 K]
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