Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values:
2CO₂(g) + H₂O(g) → (g) C₂H₂(g) + 5/2O₂(g)
ΔH formation of CO₂ = -393.5 kJ
ΔH formation of H₂O(g) = -142.2 kJ
ΔH formation of C₂H₆ = -91.5 kJ