Calculate the enthalpy of formation for sulfur dioxide, SO2, from it's elements, sulfur and oxygen. Use the balanced chemical equation and the following information.

S(s) + 1.5O2(g) > SO3(g) ∆H = -395.8 kJ/mol

2SO2(g) + O2(g) ---? 2SO3(g) ∆H = -198.2 kJ/mol

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