Use the bond energies below to determine whether the following reaction is exothermic or endothermic: H₂ + Cl₂ → 2 HCl H-H (bond energy: 436 kJ/mol) Cl-Cl (bond energy: 243 kJ/mol) H-Cl (bond energy: 431 kJ/mol) A)Exothermic with more than 50 kJ of energy released. B)Endothermic with more than 50 kJ of energy absorbed. C)Exothermic with less than 50 kJ of energy released. D)Endothermic with less than 50 kJ of energy absorbed.

Question

Quizplus · Accepted Answer

The reaction is exothermic. Breaking H-H and Cl-Cl bonds requires 679 kJ/mol (436 + 243), while forming two H-Cl bonds releases 862 kJ/mol (2 x 431). The net energy change is -183 kJ/mol, indicating more than 50 kJ of energy is released.

Use the Bond Energies Below to Determine Whether the Following