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 less than 50 kJ of energy released
B. exothermic with more than 50 kJ of energy released
C. endothermic with less than 50 kJ of energy absorbed
D. endothermic with more than 50 kJ of energy absorbed
Answer: B
Environmental & Atmospheric Sciences
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