Elemental sulfur occurs in several forms, with rhombic sulfur the most stable under normal conditions and monoclinic sulfur somewhat less Calculate the change in enthalpy for the rhombic to monoclinic transition as shown by the following reaction: S(s, rhom) → S(s, mono) S(s, rhom)  + O2(g) → SO2(g)               ΔH  =  −296.83 kJ S(s, mono) + O2(g) → SO2(g)             ΔH = −297.16 kJ

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