Find the bond energy of the O-O bond from the following data: CH 3 -O-CH 3 (g); ΔH f ° = -184 kJ, CH 3 -O-O-CH 3 (g); ΔH f ° = -73 kJ, O(g); ΔH f ° = 249 kJ

Adding a gaseous O atom to the ether forms one O-O bond: CH 3 OCH 3 (g) + O(g) → CH 3 OOCH 3 (g); ΔH = -73 - (-184 + 249) = -138 kJ. So BE(O-O) = 138 kJ/mol. This is option (a).

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Chemistry - Thermochemistry Question with Solution | TestHub

ChemistryThermochemistryBond EnthalpyEasy2 minQB

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Find the bond energy of the O-O bond from the following data:

CH₃-O-CH₃(g); ΔH_f° = -184 kJ,

CH₃-O-O-CH₃(g); ΔH_f° = -73 kJ,

O(g); ΔH_f° = 249 kJ

Options:

Answer:

Solution:

Adding a gaseous O atom to the ether forms one O-O bond: CH₃OCH₃(g) + O(g) → CH₃OOCH₃(g); ΔH = -73 - (-184 + 249) = -138 kJ. So BE(O-O) = 138 kJ/mol. This is option (a).

Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Bond Enthalpy

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