What is the standard enthalpy change for the decomposition of one mole of SO₃? 2SO₂ + O₂→ 2SO₃ΔH°_rxn = -198 kJ/mol A) 198 kJ/mol B) -99.0 kJ/mol C) 99.0 kJ/mol D) 396 kJ/mol E) -396 kJ/mol

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The given reaction is the formation of SO₃ from SO₂ and O₂ with ΔH° = -198 kJ/mol for 2 moles of SO₃. The decomposition of 1 mole of SO₃ is the reverse reaction, so the enthalpy change is +99 kJ/mol.

What Is the Standard Enthalpy Change for the Decomposition of One