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Answer:
B.) –197.8 kJ
Balanced equation : 2SO₂(g) + O₂(g) → 2SO₃(g)
Given:
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products energy = reactant energy
-593.6 + O₂ = -791.4
O₂ = -791.4 - ( -593.6)
O₂ = –197.8 kJ