ΔH for the reaction, SO₂(g) + ½O₂(g) ⇌ SO₃(g), is −98.3 kJ. If the enthalpy of formation of SO₃(g) is −395.4 kJ then the enthalpy of formation of SO₂(g) is:
- A−297.1 kJ
- B493.7 kJ
- C−493.7 kJ
- D297.1 kJ
✓ Correct answer: A
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