Using the standard formation enthalpies that follow, calculate the standard enthalpy change for this reaction. 2H2S(g) + 3O2(g)---->2H2O(g) + 2SO2(g)       rH° =_____________  kJ Species      fH° (kJ/mol) H2S(g) -20.6     H2O(g) -241.8 SO2(g) -296.8

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