The bond energy of H-H is 436 kJ/mol, Cl-Cl is 242 kJ/mol, and H-Cl is 431 kJ/mol. Calculate ΔH for the reaction: H₂(g) + Cl₂(g) → 2HCl(g).
- -247 kJ
- -184 kJ
- -184 kJ
- +184 kJ
📝 Batafsil tushuntirish
ΔH = Σ(Bond energies of reactants) - Σ(Bond energies of products).ΔH = [436 + 242] - [2 * 431] = 678 - 862 = -184 kJ.