J.R. S. answered 11/04/17
Tutor
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Ph.D. in Biochemistry--University Professor--Chemistry Tutor
See my answer to a similar problem. The only differences are the ∆Hformation values given for SO2 and SO3.
https://www.wyzant.com/resources/answers/415715/how_do_i_solve_a_heat_of_formation_similar_to_this_one