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  4. Energy of activation of forward reaction for an endothermic process is 90 k J. If enthalpy change for the reaction is 50 k J then activation energy for backward reaction will be

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Q. Energy of activation of forward reaction for an endothermic process is $90\, k J$. If enthalpy change for the reaction is $50\, k J$ then activation energy for backward reaction will be

J & K CETJ & K CET 2015Chemical Kinetics

Solution:

Given, $E_{f}=90\, kJ E_{b}=?$
$\Delta H=50\, kJ$
$\Delta H=E_{f}-E_{b}$
$50=90-E_{b}$
$E_{b}=(90-50) kJ$
$E_{b}=40\, kJ$