Standard enthalpy of formation of three combustible isomers compound A , B , C are − 20 kcal / mol , 30 kcal / mol and 40 kcal / mol respectively then what will be order of their magnitude of enthalpy

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Standard enthalpy of formation of three combustible isomers compound A , B , C are − 20 kcal / mol , 30 kcal / mol and 40 kcal / mol respectively then what will be order of their magnitude of enthalpy of combustion -

TestHub · Accepted Answer

A → B Δ H ∘ Rxn ​ = 50 kcal / mol Δ H ∘ C ​ [ A ] > Δ H ∘ C ​ [ B ] B → C Δ H ∘ Rxn ​ = 10 kcal / mol Δ H ∘ C ​ [ B ] > Δ H ∘ C ​ [ C ] So order will be Δ H ∘ C ​ [ A ] > Δ H ∘ C ​ [ B ] > Δ H ∘ C ​ [ C ]

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