Given the Following Two Equations and Their Respective Enthalpies

question 45

Multiple Choice

Given the following two equations and their respective enthalpies:
S (s) + O₂ (g) →SO₂ (g) D H _rxn = - 296.8 kJ/mol S (s) + ³/₂ O₂ (g) →SO₃ (g) D H _rxn = - 395.6 kJ/mol What is the enthalpy change D H _rxn for the following reaction?
2 SO₃ (g) →2 SO₂ (g) + O₂ (g) D H _rxn = ???

• A) - 692.4 kJ/mol
• B) 197.6 kJ/mol
• C) 98.8 kJ/mol
• D) - 1384.8 kJ/mol
• E) None of these

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