Practice question

Question

Calculate Δ H for 2C(s) + H₂(g) → C₂H₂(g) given: C₂H₂(g) + (5/2)O₂(g) → 2CO₂(g) + H₂O(l), Δ H = -1299.5 kJ/mol; C(s) + O₂(g) → CO₂(g), Δ H = -393.5 kJ/mol; H₂(g) + (1/2)O₂(g) → H₂O(l), Δ H = -285.8 kJ/mol.