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Example Problem: TBE

Example Problem: TBE. Determine the enthalpy change that accompanies the reaction below. Use the method of average bond dissociation energies to determine the answer 4 x 414 + 0.5 x 498 = 1905 kJ/mol for bonds broken (this always costs energy, +ve sign)

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Example Problem: TBE

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  1. Example Problem: TBE • Determine the enthalpy change that accompanies the reaction below. Use the method of average bond dissociation energies to determine the answer 4 x 414 + 0.5 x 498 = 1905 kJ/mol for bonds broken (this always costs energy, +ve sign) 3 x 414 + 351 + 464 = 2057 kJ/mol for bonds formed (this always releases energy, -ve sign) ΔHrxn = 1905 – 2057 = -152 kJ/mol for the formation of methanol from methane and oxygen • What does this tell us about the heat content of methanol as a fuel compared to that of methane (natural gas)?

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