Bot GPT 4-o mini To determine whether the reaction is endothermic or exothermic, we need to compare the total energy of bonds broken in the reactants with the total energy of bonds formed in the products.
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Calculate the energy of bonds broken (reactants):
- For CH₄: 4 H–C bonds × 411 kJ/mol = 1644 kJ/mol
- For Cl₂: 4 Cl–Cl bonds × 242 kJ/mol = 968 kJ/mol
- Total energy of bonds broken = 1644 kJ/mol + 968 kJ/mol = 2612 kJ/mol
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Calculate the energy of bonds formed (products):
- For CCl₄: 4 C–Cl bonds × 327 kJ/mol = 1308 kJ/mol
- For HCl: 4 H–Cl bonds × 427 kJ/mol = 1708 kJ/mol
- Total energy of bonds formed = 1308 kJ/mol + 1708 kJ/mol = 3016 kJ/mol
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Compare the total energy:
- Energy of bonds broken = 2612 kJ/mol
- Energy of bonds formed = 3016 kJ/mol
Since the total energy of the bonds formed (3016 kJ/mol) is greater than the total energy of the bonds broken (2612 kJ/mol), the reaction releases energy, making it exothermic.
Given this information, the correct statement about the change in bond energy of this reaction is:
The reaction is exothermic because the total bond energy of the reactants is less than the total bond energy of the products.
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