You have the following equations: 2S (s) + 3O 2 (g) → 2SO 3 (g), Δ H = –792 kJ
2S (s) + 2O 2 (g) → 2SO 2 (g), Δ H = –594 kJ
2SO 2 (g) + O 2 (g) → 2SO 3 (g), Δ H = ?

What is the missing ΔH?

Question options:

+198 kJ

–198 kJ

–294 kJ

+294 kJ