The reaction X → Y is an exothermic reaction. Activation energy of the reaction for X into Y is 150 kJ mol − 1 . Enthalpy of reaction is 135 kJ mol − 1 . The activation energy for the reverse reaction

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The reaction X → Y is an exothermic reaction. Activation energy of the reaction for X into Y is 150 kJ mol − 1 . Enthalpy of reaction is 135 kJ mol − 1 . The activation energy for the reverse reaction, Y → X will be :

TestHub · Accepted Answer

X ⟶ Y ; Δ H = − 135 kJ / mol , E a ​ = 150 kJ / mol For an exothermic reaction ​ E a ( F . R . ) ​ = Δ H + E a ( B . R . ) ′ ​ 150 = − 135 + E aa (B.R.) ′ ​ E a ( B . R ) ′ ​ = 285 kJ / mol ​

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