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Given the enthalpies of reaction             S(s) +   O2(g)   → SO2(g)                   

Given the enthalpies of reaction

            S(s) +   O2(g)   → SO2(g)                                                        ∆∆ {"version":"1.1","math":"<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>∆</mo></math>"}Ho = -297 kJ

            2 S(s) + 3 O2(g) → 2 SO3(g)                                       ∆∆ {"version":"1.1","math":"<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>∆</mo></math>"}Ho = -791 kJ

Calculate the enthalpy change (∆∆ {"version":"1.1","math":"<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>∆</mo></math>"}H) for the reaction:

            2 SO2(g) + O2(g) → 2 SO3(g)

Question 3 options:

-197 kJ

-494 kJ

494 kJ

1088 kJ
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